I have had success with loctite superglue on computer plastic parts....
have never, though tried on amiga parts...
I have also used soldering iron and plastic filament from 3d printer/pen... does not look pretty. but it seals the plastic off....
Just don't do that to the outside....
I fixed a "bruder" tractor my todler has as his favorite toy. tossed it away and broke some parts. used superglue (loctite) and soldering iron and filament.
Still works nice....
