Has anyone tried an aluminum disc like the ones Grassy Creek sells for a sound board? Or maybe just the lid of a vegetable can or soup can for a sound board?
It might be an idea for playing with, a copper playing surface and a tin can lid for the soundboard. Both would be easy to remove, no breakage problem with copper or a tin can lid. It would be a good opportunity to try a lot of different variations with out a lot of cost in broken or messed up slate and glass.
Marvin