[olddog]

Originally Posted by Excaliber

There is always the potential for things to get ugly if you heli coil enough of those holes, binding, drilling off just a bit, helicoil sticks and won't thread correctly into the new hole. Maybe I'm just paranoid, but I've had a couple of heli coil installation jobs that took a left turn and ended up being a real nightmare. Less is better in my book, which is why I would probably try a chemical fix myself as the first step. Thats a hard call though, yeah, I might go helicoil first time in this case (for ONE hole).

I have done a few over the years. I usually have more issues with cutting good clean threads than anything else. Especially aluminum. It cuts so easy your tempted to turn too far before turning backward to cut the threads off. I do know that heli-coils need very good threads.