I think unless there is something unusual about the location of it, any thread can be helicoiled. If you are unsure of your ability to do it I would recommend having a machinist do it for you. I recently had need of one and have never done one so I got my favorite machinist to do it. It worked fine.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.