Maybe find an old used plate with other problems from where you can take the felt device from?
I saved some point plates in the 80's since I replaced the entire plate with everything on when I saw sparks on points and it ran bad. Found 4 in an old box. One was a TEC plate I could reuse for my last build. I was not aware of TEC as better back then. Later knowledge from here explained why some were extra problematic to tune in.... the ones with a propeller logo...the very one that broke the bakelite on a point. The wires are always good to spare...