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Centre popping the spot, and a small locator drill hole should surfice.
Excess pressure will cause the drill bit to wander and inefficient clamping will cause the same.
Slow and steady is the key for larger drill bits.
Blackwoods in SAust. should be able to help you out with the drill bits your asking for.
Last edited by Wilso; 25-04-2018 at 01:59 PM.
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