I've got a new favourite toy, a rivnut kit!
http://www.rivet-nut.com/Rivnut_Fasteners.asp
Well.... a cheap copy from ebay, but it does the same job.
The reason for buying this is that a lot of bits were/are fixed with self tappers, over time they just slacken up, especially the ones into the fibreglass so they will be replaced with riv-nuts. I have just used them on the drivers door panel and they work a treat!