I think a hair dryer should work. That lens material is strong but should get plyable once it's warmer and you can get some bend out of it. Okay, I'm sure there are a lot of takes on glue. I personally use Gorilla Glue - Super for most plastic things. I've found it works good for me, sets quickly, and lasts if you let is bond and cure/dry. Just my 2 cents...