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Benchmade 51 Spacers

Zippy Extensions add length, grip, adjustable balance, and protection.

Regular price $39.00 USD
Regular price Sale price $39.00 USD
Sale Sold out
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  • Product Description

    The spiritual cousin to Jimpy's discontinued Space Invaders, these Benchmade 51 spacers are made in-house from a rubbery, shatter-proof polyurethane. They extend and protect the handles of the BM 51, and enable adjustable balance with up to 2x removable tungsten weights per spacer. The adjustable weights allow you to adapt your BM 51 to suit your specific balance preference, no matter what scales or blade you are using.

    Assembly Instructions

    Remove the stock spacers and pins. Insert the Zippy spacers, and then use the stock spacers as a guide by wedging them into the channel below the Zippy spacer. Tighten the handles until they press upon the stock spacer, and then remove the stock spacer from the channel.


    • Extends handle length from 5.1" to 5.6".
    • Protects your handles from hard drops: Spacers are made from a shatter-proof polyurethane.
    • Adjustable balance: Each spacer houses up to 2x removable Tungsten weights which enable you to find the perfect balance to suit your preference.
    • Positive jimping for extra grip on ladders and chokers.
    • Each spacer weighs 0.090 oz empty, or up to 0.132 oz with 2x tungsten weights installed. For comparison, a stock Benchmade 51 spacer weighs 0.111 oz. With stock scales, Zippy spacers let the BM51 weigh 3.173 oz (empty) up to 3.258 oz (with all 4x weights).

    Recommended Balance Configurations

    If you wish to use these spacers with the pocket clip, I recommend you counterweight the safe handle spacer with both Tungsten weights to compensate balance for the additional weight of the clip.

    Customer Reviews

    Based on 8 reviews
    Baylee Smith
    You have to give it a try

    The zippy benchmade 51 spacers are amazing. I always wanted to fully customize my BM51.Ever since I bought my 51 years ago I wanted to get flytanium v4 scales and I eventually was able to purchase them. When I put the scales on it became to handle heavy for my preference. So I bought these spacers and with the weights out they are perfect for me light handle bias with the v4 scales and the extra length makes flipping even better. 10 out of 10 would recommend.


    Look great! I like the material! Haven’t used them cuz my parts for my bm 51 are getting modded but I bet they will work wonders.

    Jack Donahue
    My 51 is now a flipper!

    The 51 was a grail for me but wasn’t my favorite to flip. It was to light. With the loss of the latch and clip it doesn’t seem much heavier but now it’s more balanced. With both weights in it feels amazing with the weight at the handle ends. That plus the jimping has greatly improved my 51’s status in my collection. Don’t hesitate

    Kyle M
    Where have these been all my life?

    If you are anything like me then you love Benchmade and Balisongs. More likely than not the 51 was your favorite flipper at one point, but as your collection grew your 51 just didnt have the weight or length you were looking for and was set aside to gather dust.

    Well dust that bad boy off and get yourself a set these babies to give your 51 a whole new life. These spacers make it feel like a completely different knife and give you everything that was lacking from the stock 51. Plus they add some serious style points. 10/10 would recommend.


    The 51 is short so the extra length was fantastic and the weight system is a godsent!


    International shipping

    International Shipping

    Zippy ships international, but the buyer accepts the risk for lost, damaged, or seized packages-it is the customer's responsibility to comply with all local laws and regulations when importing and using this product. It is the customer's responsibilities to be aware of all import requirements when ordering, including but not limited to paying customs/import/duty fees. All international customers: it is your responsibility to looking up your country's customs requirements when you order to ensure you are in compliance, and interface with your country's customs and pay all associated fees if necessary.

    For EU customers, be advised that customs will apply a VAT fee of approximately 30€ for importing products that exceed 100€. This is subject to change depending on up-to-date EU regulations; it is the customer's responsibility to verify this at the time of your purchase.

    For questions and concerns (looking at you, Aussies), please contact me at If the Zippy is shipped in 2 packages, you will need to assemble the trainer following these instructions:

    Zipper Assembly

    Cycloid Assembly

    My package hasn't arrived, or my package is lost; what should I do?

    Noooooo! Don't panic yet. So far I've never actually had a package get lost in the mail, although delays with USPS aren't unheard of, especially if the shipping is international. If you're a US-customer and your package is lost in the mail, appears lost in the mail, or was marked delivered but wasn't actually delivered, call the USPS immediately (1-800-275-8777)**. The faster they get on the case, the more likely you'll reach a timely resolution and get your Zippy ASAP. You can email me about it, but once I ship it out, I don't have access to any additional information that you don't--I'm just going to refer you to call the shipping carrier for resolution.

    **Some tips when calling USPS:
    (1) Do not use speakerphone, as this will confuse the automated system.
    (2) From the automated menu, say "Package," and follow the prompts with your tracking number.
    (3) When it offers "visual mode," I recommend you use it. It's faster and more streamlined.
    (4) At the end of the automated system which will track your (delayed) package, say "agent" or "representative" so you can speak to an agent and explain the issue.
    (5) Sometimes they only allow the sender to open an investigation. If that's the case, shoot me an email asking for the shipping label, and then use the return address information on the shipping label to provide the sender information.

    If you are an international customer and your package hasn't arrived yet, contact your local postal service that interfaces with USPS to evaluate the situation--worst case scenario you may need to reach out to customs to see if your package made it through or was seized. It is the customer's responsibility to comply with all local laws and regulations when importing my products.

    Hopefully your package is just delayed (this has always been the case historically when a package appears lost), but if it is actually lost in the mail, I'm very sorry. Believe it or not, it's just as heartbreaking for me as it is for you, since I make every balisong myself and put a lot of love into each one. Unfortunately, I am unable to take responsibility for packages that get lost in the mail (or seized by customs). I offer a variety of shipping options which have different levels of pricing and reliability/risk, and it's up to you to choose what is best for you. I am unable to replace lost packages for free, since each product takes me a considerable amount of time and financial investment to make; I'm not a big Amazon company that manufactures their stuff overseas. Thank you for understanding.

    Warranty & Returns


    If part of the Zippy breaks within 1 year of purchase and it affects functionality, I will replace it for free. Contact me at

    In order to qualify for this policy, the issue must affect the function of the balisong. Normal wear and tear (including scratches and dings caused by repeated impact) is not covered by this warranty unless it affects the functionality of the balisong or I determine it to be the result of a manufacturing defect. In order to reduce cost for the customer, the Diode is not covered under the Zippy Warranty.

    Worn M2 x 0.4mm nylock nuts are consumables and should be replaced from time to time if you disassemble frequently--these are not covered by the warranty.

    Returns & Order Cancellation

    I do not accept returns or refunds. All orders are final. Packages that are delayed or lost in the mail are not my responsibility. Many of my products are made-to-order and by the time you contact me to cancel, I may have already begun working on your parts. I am a one-man operation and returns are far too time consuming and costly to deal with. I appreciate you supporting my small business.


    By using this website and/or purchasing any Zippy Balisong LLC products from this website or other sources, you agree to abide by all of the following terms and conditions:


    Zippy Balisong LLC modifications are aftermarket mods that the customer installs themselves. The mods do not include a knife or trainer, and it is the customer's responsibility to follow the assembly instructions (listed on each product page) when installing the aftermarket Zippy mods. If you have any questions during the assembly process whatsoever, do not hesitate to contact me for clarification ( Improper installation can lead to property damage and injury, and the onus is on the customer to abide by safe practices when assembling and using these products--any injuries or damage to the customer's knife/trainer or other property during the assembly process or use of the balisong is the responsibility of the customer. Balisongs (whether trainers or knives with a sharp edge) carry inherent risks, and it is the customer's responsibility to operate all Zippy-modded balisongs in a safe and responsible manner to themselves, and everyone around them, including pets and property. To ensure safety, the customer must verify proper hardware tightness (including threadlock and installation), structural integrity of the balisong and all installed mods, and function of the balisong and all modifications prior to each use. It is the customer's responsibility to read the entire product description for each Zippy product they use to ensure they are using the product within recommended guidelines (for example, per the product desccription: the ZippyLucha should not be used at a functional work knife or manipulated over hard surfaces such as concrete). It is the customer's responsibility to comply with all international, federal, and local laws and regulations when importing and using these products.

    Zippers, Cycloids, and Diode's are not real knives. These products are balisong trainers, not real knives. The blades are made of plastic, weighted with tungsten. This is not a weapon or a cutting tool and is used for recreation and training only. It is the customer's responsibility to comply with all international, federal, and local laws and regulations when importing and using these products.

    You agree to not copy, modify, creative derivate works of, or reverse engineer, in whole, or in part, for any purpose: Zippy's website, products, and intellectual property, including concepts, prototypes, all products, designs, text, and photographs.

    Privacy Policy

    When purchasing products, you agree to provide accurate information (name, contact method such as email, address, credit/debit card information, and other information. Zippy Balisong LLC reserves the right to request identification following payment to verify your identity and prevent fraud. Zippy Balisong LLC will not sell your personal information to third parties. Zippy Balisong LLC will not share your personal information with third parties without your permission except in response to inquiries by law enforcement and government agencies, or if I have reason to believe your use of the website and purchase of products is for an unlawful purpose. These cases that do not require your consent to share data consist of: court order, a subpoena, legal process, governmental request, or to investigate fraud.