I've used them before, I wouldn't do it unless its a last resort. You end up drilling a big hole, sometimes they go in well, often they don't.
This.
I use them for the job traveler track on the Viper so I can take it off for singlehanding easily. Sometimes they set real nicely, sometimes they don't. I really don't think they would hold up to a main either, at least not the size that I use. I'm not a fan of rivnuts they have their uses, but they can be a massive pain to use.
Plus, you'd still be looking at more work than just dealing with the wrench on the stick method.
