These CNC-machined aluminium blocks attach to the Rexy Wheels using the existing holes in the housing, and allow you to clamp a Delrin collar around the wheel shaft. Delrin is incredibly low-friction, and so by tightening the clamps you can apply incremental friction to the shaft. This gives you very fine control over the movement of the wheel. If you use just a small amount of friction, it will prevent the wheel moving when you take your hands off. But if you apply a large force, the you can really stiffen the wheel up, which is a feeling that some operators prefer. 

This kit consists of 2x Friction Blocks.

Each Friction Block comprises and Upper and a Lower Clamp, and a round Delrin Collar. 

The Lower Clamp attaches to the Housing with 2x M4x20mm screws, and the Upper Clamp clamps to the Lower with 2x M4x20mm screws. It is recommended that you tighten the 2x M4 clamping screws a bit at a time, and go back and forth between them, so that it clamps evenly.