How to drill holes in semi-precious stone with a diamond drill bit. With Knack!

How to drill holes in semi-precious stone with a diamond drill bit.  With Knack!
  John Hart
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Knack shows you how to drill through semi-precious stone using a diamond drill bit and a drill press. The clamp used is a flexible rubber pipe connector or coupling (these come in all sorts of sizes, i'm sure you can find one to clamp just about any size

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