I was going to suggest an epoxy too. I wouldn't use gorrila glue on something like that, especially with the abuse it takes. Works awesome to repair furniture though. Especially if the parts your glueing back together have become loose because the parts have worn and there's a lot of space. The gorrila glue expands and takes up the space.

 

I would suggest Titanium weld from advanced auto or auto zone. It is super strong and is fully cured in about 15 min. I used it to repair a broken headlight mount on my freinds 700 raptor about 5 months ago still holding up

 

I like "The Welder" it is sold at Wal-mart, SHop-Ko and the like. Needs 24 hrs to cure completely but holds very well! It does not dry completely stiff so that might help in a situation like the headlight where it might be prone to vibration. I have patched a tire with a hole the size of a dime with this stuff.

 

Gorilla Glue is a super strong urethane based glue that was designed primarily as wood glue. It expands and fills gaps very well plus it is very strong. It works well with many porous materials. I have used it and similar products many times to repair badly damaged furniture & it is great stuff. Plastic is not very porous nor is it very rough. You will need to rough up (sand) the surface to give any adhesive a chance to ?bite? the material. If it doesn?t bite either physically or chemically it will not hold. Weld-on has adhesives that are designed to work on various plastics check the web. Devon sells a product called Plastic welder that is methyl acrilate a product used in the dental field to repair bridges and such. I use it a work to repair styrene and it works well and fast. It would be best if you can identify the material of the item you intend to repair & match it to the proper adhesive.
Of course you could use duct tape.

Xring