I have a cheap vibratory tumbler with a mix of ceramic media that I use for refinishing blades and titanium handles. Perhaps it can work for micarta? I love "soft" feeling micarta scales/handles, much more than the polished finish that feels alot slicker. I thought it might be a safe way to take a polished micarta to a rougher finish with more fibers exposed, repeatable and not too aggressive. I could be totally off base, just kind of thinking out loud. Curious if anyone else has tried it. Thinking about buying a cheap micarta knife for experimentation.