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Old Dec 27, 2010 | 11:57 PM
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vaughant
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From: south wales, swansea
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Originally Posted by andy130
is that the one that looks like a nomal bit botters?
Nah,machine mart ones have the springloaded plunger and like a mini hole cutter around the outside.

Otherwise try a cobalt spotweld drill but as said above slowly and perhaps some sort of coolant/rtd spray.

Ive used both and found the machine mart version far more effective.
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