Originally Posted by
Malcolm McLeod
Back in the day - about when your '80s' monster was built - I dealt with a lot of injection molding and extrusions in various polymers.
I knew the processes, tho' am not an expert on the chemistry. I do know that plastics will not age terribly well. They will become increasing brittle with exposure to UV, heat, some chemicals, etc. And sometimes just air, as the volatile components cook off over time (depends on the specific polymer).
So repairs to the part in question may 'hold', but the repair material may simply shift the point of failure to the next stress concentration.
Bottom line, if this is to be a user and the part in question is not cosmetic, I'd look at replacement.
...Can't see the part in question on my phone, but getting a new part manufactured will be UGLY expensive I bet (thinking >$1000 to hang an injection mold and shoot 1 part). CNC, 3D print, or 'pour molding' a copy may be only affordable options. ...Or buy NOS off the shelf from manufacturer?