Originally Posted by
3alarmer
...+1 to all of this. If you've ever done one, you see right away that these are not helicoils, but rather stamped sheet metal of some sort. with inner and outer threads provided courtesy of the forming process, not wound steel like helicoils.
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You are correct. I have some here that are 26 tpi outside and 20 tpi inside. been a while since I've done such a repair, but the reamer/tap set I have is a Cyclus brand.