I've a plastic cold water filter that is some 150mm in diameter and is assembled using eight 4mm dia self tap screws. Five of the screw holes have partially or totally stripped their thread, not so much due to abuse - possibly in the original assembly though (!) - but I think due to an over large hole existing in the manufacture for the pilot hole.
The plastic is hard but I is I think thermoplastic rather than thermosetting - what suggestions are there for a solution ?
There is not enough material to drill and plug - I could go up a screw size but buying in a small number of SS screws is not preferred at the moment.
I have thought of spraying the screws with silicon, filling the holes with epoxy and then putting the screws back in. Would this work ? Once reassembled I think is unlikely the assembly will be taken to pieces again.
Thanks
Rob