How to chase helicoiled threads?

View attachment 1715055025Have you ever used these?, they are WAY better than helicoil repairs, you drill then tap to the specific size to the threaded insert ( that info is supplied with the insert ), then simply turn them in and then strike down the four small pins with a punch, not only did you fix it but it will NEVER come back out, I have a marine repair shop we use these all the time I stopped using helicoils years ago.

I work for a NASA contractor and we use this "Keensert" style exclusively. For an airtight (or watertight) seal, they are installed with a little epoxy applied to the external threads.