Chris Bacon wrote:

even if the 5 and 6mm bits were equally sharp. You could also consider
"opening up" a smaller hole by drilling it with the smaller sharp bit,
and then redrilling with the larger bit.


.... although without care this is likely to result in the TC tip
shearing off.

if the drill is knackered anyway there is not much to lose though ;-)


--
Cheers,

John.

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