Looking for a micro slide switch On/Off guard that will work on a vintage RC transmitter
The damage is done to both ends from excess torque on the flat screw. 

It needed a stress relief soft washer like a thin layer of silicon or nylon around the shoulder to isolate the brittle plastic from uneven forces.

My fave solution for this is a drop of polyurethane subfloor adhesive on the mating surfaces applied with a toothpick for tiny parts. It takes  days to air dry unlike the former high VOC stuff that was great plastic.

Looks like the 1st plastic "Bakelite" a very brittle product.