Plastic welding

[Grahamm]

Also, super glue mixed only with baking soda, or even white polystyrene can have some unusually tough final mixtures, but watch the videos online to give you a much clearer idea how and where to do things. 

If you're going to do the superglue and baking soda technique, make sure you get decent quality components.

I tried it with some superglue from Poundland and baking soda from eBay and it didn't work well at all