Gear Selector repair?

[Factory Guy]

Anybody had their plastic (thread) area that controls the gear elector for the transmission break off the plastic housing?

I was trying to re- attach mine today and while testing it, after getting it reassembled, I guess the THREAD (cut through, or pulled too hard on the plastic piece) and it broke off? Yes I realize it is 50 year old plastic

If you have fixed one how did you fix it?

I read some where, at some point, somebody was using a glue ( don't remember what kind) and then putting baking soda on it to cure it to make it super strong??