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Thread forming tap..
The description of a thread forming tap indicates that it doesn't make any chips. This type of tap actually looks very similar to a thread chasing tap.
I think I like the idea of using a bolt and cutting a minor groove through the threads to serve as the cleaning action when chasing the hole.
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Thank you,
HFR_Racer
'87 930, 3.3 liter, K27 hybrid, Kokeln IC, Andial, B&B, Borla, 17" Supercups.
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