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Cheers. That makes sense.
I'm now nervous about fucking those up too. Is there anything I can do to prevent further damage?
The thing that is a pain is that the bolt does not go all the way through to the bottom, so the first 1-2mm of threads are important as they account for maybe ¼ of the contact.
hugo7
Probably because the damaged threads in the end have caused the tap to start cutting threads off set.
Can you not start tapping from the other side of the hole?