EQ Mount Counterweight Adapter for Dumbbell Plates

The adapter was designed for plates with the following dimensions:

• Inner diameter: 31 mm

• Plate thickness: 34 mm

• Mount counterweight shaft diameter: 12 mm

The main version is designed for one plate (tested with a 1.25 kg plate).
An additional back part is included so the holder can also support two plates if more counterweight is required.

This provides a flexible and inexpensive alternative to the original EQ2 counterweight.

Clamping screw

The holder uses the original EQ2 M8 locking screw.

Recommended screw specifications:

• M8 screw

• Length: 40 mm or longer

• Smooth section: ~12 mm

• Threaded section: ~15 mm (thread located on the outer side of the hole)

The screw presses directly against the counterweight shaft to lock the holder in place.

The original EQ2 mount uses the same locking method to secure the stock ~3.5 kg counterweight, so the clamping principle and load conditions are similar to the factory configuration.

Material recommendation

This model was designed and tested with PETG.

PETG is recommended because it provides:

• good layer adhesion

• better impact resistance than PLA

• improved durability under mechanical load

PLA may work for light setups, but PETG or stronger materials are recommended if the holder will support heavier plates.

Print orientation

Print the parts exactly as shown in the photos.

The threaded hole for the clamping screw is printed in horizontal orientation.

To improve thread quality, a layer height modifier of 0.2 mm was applied in this area.

Recommended print settings

• Material: PETG

• Layer height: 0.28 mm

• Walls: 6

• Top/Bottom shell layers: 6

• Infill: 25–40%

These settings provide sufficient strength for supporting metal plates used as counterweights.

Customization

The model can be easily adapted to other plate sizes by adjusting the internal diameter or plate thickness in CAD.