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Raspberry Pi Class
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Many of my taps have a conical tip not a centre hole in the end. I took a piece of round bar stock and, using a centre drill in the lathe, drilled a shallow hole with taper into which the pointed end of the tap will sit and centre. I put that into the drill chuck instesd of the
Regrettably, nearly all my taps have a pyramidal pointed end at the shank, they don't have a hole for a centre.