I follow Crimson Guitar’s blog. One of the ideas he shared a few months ago was using leather instead of felt between the guitar and the strap button. I got some cheap scraps from a local leather works store while visiting my in-laws and finally sat down to make the leather washers.
Crimson Guitars uses a leather punch and mallet. I just traced a felt one and cut it out with scissors. To get the hole in the center, I tapped the leather circle to a block of wood and used a short dry wall screw and a screw driver to make the hole. It worked really well!
Maybe one of these days I’ll get a picture up of it.