Rim cylinder holder

Rim cylinder holder to stop those rim cylinders jumping around while picking.

The screws may not go into the rim cylinder properly, possible causes could be:

1. The threads are slightly dirty, check that the screw supplied with the cylinder set still works.
2. The supplied screws are not the correct size.

In the case of B, see if the screws supplied with the cylinder will work as a replacement to the screws supplied in the kit.