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I'm a trimmer from way back and that always seemed to work. Just try it on one hole of course to see if it will work. Try a drill bit that is the...
Are the studs too wide to fit the hole? What if you were to open the hole a little with a drill bit. These studs can't be too tight as they will...
I did that with my friend's spoiler on his Mustang. Worked like a charm and solid. If you can get those studs to work then all the better. Good luck.
If you used the helicoil you can just use a regular bolt and wouldn't need those special bolts
Would a Helicoil work?