about harm of oil on thread (especially aluminum)

[Huw Powell]

> I need an advice how to fix this situation.  I don't recall seeing
> helicoil for 6mm thread. Does it exist? Stepped stud would be perfect
> probably, but where can I get it fast is US?

Can't say for sure, of course, but I think I've seen metric stepped
(dual diameter) studs at the hardware store near here, whihc is not huge
by any means.  Of course I might be dreaming...

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/