Thanks! Once I realized the other 2 tabs are still there and working, it became less of a priority. So, I'll be getting the right glue and do it next week or so.As far as glue, I would have guessed the old school Testers model glue. Made even a pvc glue for pipes with the purple primer. Just a dab will do.
You do want the plastic parts to melt back together to form the bond. Gorilla glue doesn't melt the plastic, same with the super glue.
Just my two cents from an ancient model builder.
Isn't model glue just CA glue? (cyanoacrylate?) If so, I may have some of that around. Just gotta be careful how much of the plastic melts, because the tab that broke off was attached along the long side and both ends.