Apologies if it has been mentioned before but I have used this stuff to fix motorcycle fairings and other broken plastics and thought I would pass it on.
It can be bought from http://www.repairproducts.co.uk/page20.htm or http://www.plastexexpress.co.uk/plastex_kits.htm .
My driver's side window switch has the front lug broken and I am currently rebuilding the lug using Plastex (I will post a picture when it is finished).
For those that do not know, it comes in a powder form and is set by adding a liquid. Once set it can be drilled, filed and threaded and it has saved me a fortune by fixing bike bits and other stuff.
Just use it in a well ventilated room

Tony