On Oct 2, 10:39*pm, Steve Sr. wrote:
Hello,

I have an 1992 vintage MTB that uses a Shimano Rapidfire brake
lever/integrated shifter. The threads in the shifter that hold it to
the brake lever have become stripped and no longer hold. ...

Repair Options?

1. Find a real metric heilicoil and install it. Do they even make
metric heilicoils this size and where do I find one?

Yes, they make them. I've bought them in the past.

Search online. Try Google.

- Frank Krygowski