Need to glue a small plastic switch housing back together,need something from a big box or hardware store.
Depending on the break I have good luck with hobby level super glue and the spray on accelerator. I also reinforce it with some thin fiberglass cloth and super glue over the cracks on the back or inside of the part. An interior guy I work with uses this technique on 40+ year old plastic to reinforce it, it works pretty good.