I am not CP, but cut my shims from beer can stock with a compass with a cutting blade. It won't cut much thicker than .005" and is hard to get an accurate size, but not too bad. For liner shims that are thicker, I use a lathe to turn and bore it to size, and then part it off to thickness. It will have to be about .020" thick to not disintegrate or deform. A slightly lower tech liner shim can be made with a piece of soft copper wire. It will flatten out a bit when tightened so start a bit thicker than what you want, and maybe squish it in a good flat machinist vise. It can fit around the locating pin if the motor is equipped that way.