How to drill holes in sea shells or sea glass

Time for a bit of non-photography craft now. I spent some time last night drilling a collection of shells and sea glass to make hanging decorations, and I had to search around a fair bit looking for instructions, so I’m going to lay out how I did it to help other people in the same situation. Before I start let’s just get this out of the way:

Warning! Drilling stuff is dangerous! If you accidentally drill a hole in your hand/get shell in your eye/inhale silica dust/lose your hearing using these instructions, I am not ...

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