If you’re having to use production gear well beyond its prescribed end of life period and you’re either missing or have damaged unique, but important, plastic parts, it’s time to get out your saved broken parts and use them as templates to make new ones.
I saw this Plastex stuff mentioned for repairing plastics for all kinds of unique tabs, brackets, flanges, knobs, stripped thread wells, etc. It actually re-creates an exact duplicate of a broken part. They said it bonds at a molecular level, unlike topical glues, so it’s as good as the original. I don’t think I’d trust it for high stress points though. If you don’t have a machining tool, CNC or 3D printer, this looks like a great fix for speacialty fittings that are no longer made or too expensive to justify replacing.
Demo Video
http://www.plastex.net/How_To_Videos.php
(7:38) Repairing Stripped Thread Wells
(15:40) Repairing Custom Tabs, Brackets & Flanges