I had some aluminum cylindrical spacers that were formed by rolling a flat piece, so they were already split. It wasn't quite the diameter I wanted, so I carefully pushed my awl into it to widen it. A reamer would work as well and since the spacer was aluminum, it wasn't too tough. Make it a little wider across than the head of the screw that will need to fit through the rubber. Next I used a file to sharpen the business end. Then I took a little more off the inside edge that would start the cutting when it was spinning clockwise, which would be the right fo both pictures. Finally I took another spacer and put in in the non business end and crimped it down to give it some strength.
Stick that in a manual (not power) drill, carefully line it up on the foot, and go very slowly.
