Hudy XB4 aluminium shim for setup system
Hudy have released this aluminum shim for the XB4 which fits on the rear wheel axle, and the set-up system leans against the shim. For use with XRAY XB4 or any off-road car on which the set-up system cannot be inserted on the non-threaded part. The set-up system will then sit properly on the threaded area of rear wheel axles only.
Source: Hudy [hudy.net]