Jon,
I feel your pain. I removed these bushings from a early 90's keyboard recently and they are double sided tape bushings. Along the left side of them in the picture is the hot melt bushing cloth. While we can still get pretty good bushing cloth from some supply houses, it seems that bushing cloth in production keyboards and buttons is more of a felt than a cloth. The poor glue and cloth leads to quick failure. Below is a picture of supply house buttons purchased long ago and could not be used because the glue has failed (prior to installation) and no two mortises are the same size or same shape. Yikes, be careful. Mike
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