Shims

The RetroArms stainless steel shim set is designed for gears with 3 mm axles. The shims fix the exact position of the gears in the gearbox; proper shimming ensures correct meshing, lower noise, reduced friction and a longer service life for the gears, bushings and motor.

Features

• Material: stainless steel
• Inner diameter: 3 mm (axle bore)
• Assorted thicknesses
• Compatible with V2/V3 gearboxes and derivatives with 3 mm axles

Package Contents

• 10 shims with 6.2 mm outer diameter and 0.1 mm thickness
• 10 shims with 6.2 mm outer diameter and 0.2 mm thickness
• 5 shims with 8 mm outer diameter and 0.1 mm thickness
• 5 shims with 8 mm outer diameter and 0.2 mm thickness

The RetroArms set contains 10 shims of 0.2 mm for adjusting the axial play of the gears in the gearbox of AEG replicas.

Specifications

• Thickness: 0.2 mm

Package Contents

• 10 shims

The RetroArms set contains 20 ultra-thin 0.01 mm shims for 3 mm axles. They allow very fine adjustment of the gear position in the gearbox.

Features

• For axles with a diameter of 3 mm

Specifications

• Thickness: 0.01 mm

Package Contents

• 20 shims

The Element shim set contains 18 pieces in three thicknesses for adjusting the axial play of the gears in the gearbox. Proper shimming reduces noise and gear wear.

Features

• 18 shims in total
• 6 pieces of each thickness

Specifications

• Thicknesses: 0.2 mm, 0.3 mm, 0.5 mm

The Golden Eagle spacer is a replacement part for the internal mechanism of airsoft replicas. It is used for adjustments in the gearbox or the hop-up assembly, depending on the configuration.

The RetroArms stainless steel spacer corrects the angle of engagement (AOE) between the sector gear and the piston. Installed between the piston head and the piston body, it shifts the piston back so that the first tooth of the sector gear engages the rack at the correct, nearly perpendicular angle.

The right thickness depends on the combination of piston, piston head and gearbox: 2 mm is the most commonly used size, 2.5 mm is for larger corrections and 3 mm for major corrections. A trial fit is recommended before final assembly, along with checking the full piston stroke and the air seal before closing the gearbox.

Benefits

• Removes the load on the first piston tooth, the main cause of its breakage
• Reduces the risk of tooth skipping in high-power or high rate-of-fire setups
• Extends the life of the piston and gears

Features

• Material: stainless steel
• CNC machined
• 3.3 mm countersunk center hole for a flat-head screw
• Reinforced version of the POM AOE shim: does not compress or deform under load
• Compatible with most pistons and piston heads (minor adjustments may be needed)

Specifications

• Thickness: 3 mm
• Outer diameter: 17 mm

Technical note: AOE correction should always be combined with a sorbothane damper on the cylinder head, and the air seal (nozzle length and piston stroke) should be rechecked after installation.

The RetroArms stainless steel spacer corrects the angle of engagement (AOE) between the sector gear and the piston. Installed between the piston head and the piston body, it shifts the piston back so that the first tooth of the sector gear engages the rack at the correct, nearly perpendicular angle.

The right thickness depends on the combination of piston, piston head and gearbox: 2 mm is the most commonly used size, 2.5 mm is for larger corrections and 3 mm for major corrections. A trial fit is recommended before final assembly, along with checking the full piston stroke and the air seal before closing the gearbox.

Benefits

• Removes the load on the first piston tooth, the main cause of its breakage
• Reduces the risk of tooth skipping in high-power or high rate-of-fire setups
• Extends the life of the piston and gears

Features

• Material: stainless steel
• CNC machined
• 3.3 mm countersunk center hole for a flat-head screw
• Reinforced version of the POM AOE shim: does not compress or deform under load
• Compatible with most pistons and piston heads (minor adjustments may be needed)

Specifications

• Thickness: 2 mm
• Outer diameter: 17 mm

Technical note: AOE correction should always be combined with a sorbothane damper on the cylinder head, and the air seal (nozzle length and piston stroke) should be rechecked after installation.

The RetroArms stainless steel spacer corrects the angle of engagement (AOE) between the sector gear and the piston. Installed between the piston head and the piston body, it shifts the piston back so that the first tooth of the sector gear engages the rack at the correct, nearly perpendicular angle.

The right thickness depends on the combination of piston, piston head and gearbox: 2 mm is the most commonly used size, 2.5 mm is for larger corrections and 3 mm for major corrections. A trial fit is recommended before final assembly, along with checking the full piston stroke and the air seal before closing the gearbox.

Benefits

• Removes the load on the first piston tooth, the main cause of its breakage
• Reduces the risk of tooth skipping in high-power or high rate-of-fire setups
• Extends the life of the piston and gears

Features

• Material: stainless steel
• CNC machined
• 3.3 mm countersunk center hole for a flat-head screw
• Reinforced version of the POM AOE shim: does not compress or deform under load
• Compatible with most pistons and piston heads (minor adjustments may be needed)

Specifications

• Thickness: 2.5 mm
• Outer diameter: 17 mm

Technical note: AOE correction should always be combined with a sorbothane damper on the cylinder head, and the air seal (nozzle length and piston stroke) should be rechecked after installation.