Devialet 220 remote control issue

[Ascot]

The knob is covered with rubber around the ball bearings. Unfortunately, the rubber also grinds laterally on the ball bearings, so it is a little stiff. In addition, the ball bearings leave dents in the rubber over time, causing jerks in the rotary motion. Better than rubber would be e.g. TEFLON been.
I have just sent a new remote control for repair, extremely stiff and jerky.