Originally Posted by Dan-M
Been using Heli-coils for decades in my shop for all sorts of fasteners. Never an issue.
As I mentioned above, once i figured out the stacking technique they went in like butter. One hole got only one insert (because I destroyed one in the tool) but that bolt tightened down just as well as the others with two inserts per hole. It's nice to finally have a good seal on those things. Now if I can just get my oil filler to stop leaking.