A stripped hole is around 10mm, which is the drill size for an M12 thread. I cleaned the hole with a 10mm drill bit, then tapped it to M12 x 1.75.
Then I got an M12 bolt from Bunnings and cut the shank off (I cut it a bit short but that is ok).
I tightened it up with double nuts and then used a die grinder to very slightly enlarge the hole on the exhaust flange so it is easier to put on.
Looks like it will last and won't end up destroying the hole like helicoils do.
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The bolt was plenty long, I just cut it a bit short. Still long enough to do the job, the nut was fully on the thread. I used some loctite on the part going into the head.TOONGA wrote:Nice fix if you are unhappy with the length of the new stud get a longer bolt... did you use loctite on the threads?