Too tight

Checked rear axle oil after warming car up with a short run. Didn't need filling because already overflowing out of drain plug (must have slightly overfilled when filling from cold). When refitting drain plug I tried to tighten with pliers, not realising that the 'cap' on the plug is thin metal and therefore I ended up pushing it off by over-tightening. I've tried re-attaching it using Gorilla glue, and it looks to be a good fit. 

Since there is a gasket/washer inside the plug and the oil is very viscous, I'm hoping it'll be fine. But note for the future - only hand tighten!