[bobkatfly]

Thanks Maxum. I like the insert over the helicoil. Just one thing though. The insert has a flange stop to limit the thread engagement. The o-ring seal on the plug is a face seal so it would compress on the flange.

It seems the counterbore tool in the kit creates a counterbore that the flange sits in so if you control the bore depth you can get the flange to sit flush with the housing. Sound right?