Modify Standard Gearbox Shim Set (0.1mm – 0.5mm)


A standard shim set from Modify including 24 pieces. 6x 0.1mm, 6x 0.15mm, 6x 0.3mm, 6x 0.5mm.

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icon Description

Modify Standard Gearbox Shim Set (0.1mm – 0.5mm)

Shims of 4 gauges available coupled with small diameter and standard outer diameter types for easy identification to enable precise shimming of the gearbox.

Precisely shimming the gearbox minimizes the up-and-down play of gears to reduce noise and enhance smooth operation, as well as inter-gear efficiency to reduce load.

  1. To adjust the gap between the gears and gearbox housing.
  2. To adjust the gap or height between the 3 gears (sector gear, spur gear, and bevel gear) to minimize friction against the gearbox.

Gears must not be shimmed too tightly to avoid over-stressing the motor resulting in damage.

Why Shim the Gearbox?

  • To prevent gears from rubbing any other part of the gearbox, where contact should only occur between the gear shafts and the ball bearings, the cogs of the gears, the sector gear and the piston, the cam of the sector gear, and the cut-off lever; the sector gear and the tappet plate.
  • To reduce friction between gears and ball bearings. To reduce friction between gear wheel sides and gearbox, high-quality AEG shims of the suitable gauge must be used to enable adjustment of the gear gap for minimal friction.
  • To adjust gears to achieve maximized direct contact against cogs of another gear so as to realize optimal torque transfer between gear and piston as well as cam of tappet plate and cut-off lever.


  • Material: Stainless steel
  • 4 types: 24pcs in total (6x 0.1mm, 6x 0.15mm, 6x 0.3mm, 6x 0.5mm)
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  Modify Airsoft Guns produce a range of weapons, including AEGs, bolt-action rifles, AEG internal upgrade parts and gas gun upgrade parts. These are made with absolute precision, are user friendly and offer a high firing accuracy to impress many players and gunsmiths! Modify is one of the leading Japanese manufacturers in the industry and consistently produces high-quality airsoft products. Read more >>
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icon    Delivery Times and Costs View our Delivery Times and Costs

At Socom Tactical we aim to ship all orders same working Day During our working hours. All orders before 14:00 we aim to ship the same day. Shipments are shipped Monday, Wednesday, Thursday, Friday sadly due to no collections we are unable to ship Saturdays.

Pricing and Times

UK Mainland   £6 or Free on orders over £100

Europe   £10 - Delivery 3-7 working days (Excluding any customs delays)

Rest of the World   4- 14 Working Days (Excluding any customs delays)

Additional Time There May / Will be additional delays for Remote UK, Highlands and Islands, as well as Northern Ireland typically this, adds an additional 1-2 working day

UK Shipping Methods -   Typically most orders over £30 or 1kg are sent via DPD local Next Working Day delivery. You will receive an email and/or Text message from DPD with a 2-hour delivery window. Packages under 1kg or £30 will be shipped by Royal Mail First Class Tracking number can be viewed on your account

EAN: GB-05-39 Category: