All. Cork vice rubber-vinyl compounds. I dunno. While still working as a Toolmaker early 60s, I made up a more than lifetime batch. We were working on a project among whose supplies was a sheet of black aerospace material that happened to be exactly the right thickness for bumper height. Salvaged some from scrap heap. BTW, I did need to make a "punch" that is still in my toolbox. These cylindrical bumpers fit perfectly (i.e. tight, snug, just enough distortion). However, I guess I didn't do that good of a job as I did need to "shave" them so as to align the valve openings. Also, had to replace bumpers on both Sansones after about 20 years. Ah well. Can't win em all. Take care. GN
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