Re: Stripped mounting stud socket
Your kit should specify which size drill bit corresponds to which tap size. You need to carefully drill out the damaged threads, then use a can of air or a compressor to blow out any debris. You should be wearing eye protection.
Then follow the insertion instructions on your kit.
I helicoiled a rack mount and it's held strong ever since, even with a loaded rack, no suspension, 23mm tires and 20+mph of non motorized road bike fun on crappy roads.