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Flow Cap Counterweight System assembled, showing the aluminium mount with its 2 O-rings fitted and the bare rear seat with no Flow Cap
What is in the Flow Cap Counterweight System box: the stainless Contact Saber Weight and the aluminium Flow Cap Mount with its 2 O-rings and 2 M4 x 3 set screws already installed, plus the PTFE shim and the stainless connecting screw shown in their assembly orientation, square to the build axis with the screw head rearward. No Flow Cap is included
Flow Cap Counterweight System
Flow Cap Counterweight System
How the joint locks, every part to scale: the Saber Hilt Extension, which is sold separately, threads to the Flow Cap Mount, and the PTFE shim and stainless connecting screw lock the two together with the 4 mm Allen key. The mount, shim, screw and key are in the box; the hilt extension is not.
Flow Cap Counterweight System rotating 360 degrees

Flow Cap Counterweight System

Mount plus stainless weight for rear-heavy balance.

Mount plus stainless weight for rear-heavy balance.

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$49.95 Regular price
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The Flow Cap Counterweight System is a rear-balance upgrade for RGB Critter saber builds, combining the Flow Cap Mount with the stainless steel Contact Saber Weight for maximum control, momentum, and stability.

This precision-machined aircraft-grade aluminum mount twists directly onto the rear threads of the RGB Critter BT or the Saber Hilt Extension, adding length while creating a rugged rear mounting point for spinning and performance flow.

Full details and specs Show less

The mount features a raised locking profile designed to interface perfectly with the Flow Cap (sold separately), holding it securely in place without clips, holes, or extra hardware. The Flow Cap pushes on and pulls off, no twisting.

Included in this system is the stainless steel counterweight insert, which adds substantial rear mass to the assembly. Stainless steel provides significantly more weight than aluminum in the same footprint, increasing centrifugal force for smoother spins, stronger momentum, and improved handling during contact-style movement.

The weight has no threads. It slides into the mount's bore, and the mount's two preinstalled M4 x 3 set screws tighten down into a machined groove in the weight to lock it in place, creating an extremely solid connection designed for repeated high-motion use.

When paired with a Flow Cap, this system becomes an essential rear-balance component for contact saber builds, Flow Chucks configurations, and modular performance setups.


Includes

  • Flow Cap Mount (aircraft-grade aluminum)
  • Stainless steel Contact Saber Weight
  • 2x M4 x 3 set screws, preinstalled in the mount
  • 2mm Allen key, for the set screws
  • Flow Cap Counterweight System Screw, the stainless connecting screw
  • Flow Cap Counterweight System Shim (PTFE)
  • 4mm Allen key, for the connecting screw

Flow Cap sold separately.


Locking it to the Saber Hilt Extension

The connecting screw, the PTFE shim and the 4mm Allen key that drives them are all in the box, and together they let you semi-permanently join the Flow Cap Mount to the Saber Hilt Extension.

The shim seats at the joint between the two parts, and the screw passes through the front of the mount into the hilt extension. Once it is tightened, the mount and the hilt extension will not unthread, rotate or work loose no matter how hard you spin. They stay joined until you take the screw back out with the 4mm Allen key.

Installing it is optional. Leave the screw out if you want to keep breaking the build down by hand, and put it in if you want a fixed, rattle-free rear end for contact and high-speed work.


Specs

  • Total rear assembly weight (mount + weight): 5.5 oz

  • Adds 54mm total length

  • Mount alone: 1.2 oz

  • Stainless steel weight insert: 4.3 oz

  • Aircraft-grade aluminum + stainless construction

Price$49.95
Regular price
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4.7 · 900+
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Designed
in Oregon

Lifetime warranty on twist-on accessoriesDefects in materials or workmanship are covered for life.

2 years on the RGB Critter BTA lifetime upgrade is available at checkout. Batteries are covered for 60 days.

Free 30-day US returnsUnused and in the original packaging, and we email you a prepaid label. International returns are accepted within 30 days, return postage is yours.

Broke in use?That is a warranty claim, with no 30-day limit. Email support@antsonamelon.com and we repair or replace it.

Full warranty policy  ·  Full return policy

Flow Cap Counterweight System
Flow Cap Counterweight System
$49.95 Regular price
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International Shipping Restriction

This lithium-ion battery cannot be shipped internationally and cannot be added to your cart.

You can purchase the required battery locally with these specifications:

  • 18650
  • Lithium-ion
  • 3.6V nominal
  • Unprotected
  • Flat top
  • 18.3mm diameter × 65.0mm length

Do not purchase protected, button top, 3.2V, or 1.5V cells.

Ants on a Melon is not responsible for batteries purchased from third-party sellers. Please verify specifications and use only high-quality lithium-ion cells from reputable brands.

LIFETIME WARRANTY
Every item in your order, for life.
Our gear comes with a 2-year warranty. This upgrade extends every item in your order to lifetime.
WHAT YOU ALREADY GET
2 years on everything in your order, free. Batteries have their own 60-day warranty.
WHAT THIS ADDS
If anything in this order fails from a defect, we repair or replace it for as long as you own it.
NO HASSLE CLAIMS
Email us photos or a short video. Most repairs are back out in 2 to 3 working days.
NOT COVERED
Drops, a cracked housing, loss, theft, broken fiber strands and normal battery wear.
International duties & VAT
A quick heads-up for orders shipping outside the US.
Set by your destination
Import duties and VAT are charged by your country's customs, not by Ants on a Melon.
Paid on delivery
Your carrier collects any charges when they deliver. Amounts vary by country.
Still fully guaranteed
Every international order is guaranteed to arrive. Need help? Email support@antsonamelon.com