I have an old Celestron Firstscope 80mm f/11 that came with a very sturdy clamshell type EQ mount.
The RA mechanism slow mo controls froze. In taking it apart I see the teeth are stripped.
I'm not sure if it can, or even should be fixed, but it would fit in a priority mail box and I'd be happy to try. It was a very sturdy mount for me, and before I just use the wooden legs on something else, I thought I'd ask y'all.