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Yeah no problem, I'll update the parametric file on Fusion360 so everyone can set whatever diameter they wish.

I've just designed a different clamp that holds the stones with velcro (hook and loop) so its a one clamp fits all deal instead of making clamps to suit different sizes, so you may want to hold on for a couple of days to see if you prefer that as I'm waiting for things to come before I can test it.