[brownbear]

helicoli kits require drilling out the threads that are there. The chips and drillings cannot be prevented from entering the case. I doubt you could do this on the vehicle. The case should be removed. Then other repair methods come into play.

I would try the longer threaded plugs and or some stuff like Decon repair putty. It cures like metal. If you intalled a bushing in the right threads with this. Then let it cure. Then you could use a smaller diameter plug.