“Broken” Switch on 215

During my recent move to Arkansas, apparently the switch on my Vandy 215 was pushed in from the frame, separating it from the metal housing bracket

that holds it in place. Nothing is actually broken or chipped, but just separated. It looks like the housing is meant to be crimped to clamp onto the plastic of the switch to hold it (see photos), but my attempts to try this (I inserted a flat screwdriver on top of that “t” shape and turned it to push the t section toward the switch wall) have not been successful. Any advice? Will I have to replace the switch? Thanks.