Originally Posted by ALUCARD19

This is what us tool/diemakers use they are called recoils they lock in place after installation by driving down the little pins, the pins cut through the threads, that way the inserts do not back out, I have used these for over 30 years and you can install and remove screws dozens of times and the insert will not back out, similar to serts except they lock in place. You can buy them at MSCDIRECT.COM industrial supply store, next day delivery. They come in different sizes and lengths. good luck with your project. Depending on size $2.00 to $4.00 each.