I will soon need to #drill a "blind" hole in an #obsidian sphere (to use it as a knob for a cane) hole diameter ~12 mm, depth, say 50 mm. Anyone can give me some hints what to use (#diamond #drill I guess, but I cannot find one) and how to do it, so I would not spoil the material?
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@8petros

I don't really have any suggestions (apart from the likely obvious warning to think about thermal stresses), but am curious how was it shaped into the ball shape in the first place.

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