Hi Col,
I got some stainless steel screws from here:
http://www.stagonset.co.uk/fasteners...=9882303_10565
For about £15 you should be able to get a near complete set + spares (and the service is very rapid). They only do down to an M3, so no diff. or shock absorber bleed screws, and you won't be able to get unusual types like a kingpin, but they only make up the minority. Plus, they seem to be hard wearing as I've not managed to strip a head on either my TRF501X or on my (sold) X10.
Just download the manual from here:
http://www.tamiya.com/japan/rc/manuals.htm
At the back is a list of all the kit components (and quantities) so ordering a set of screws should be a cinch.
Enjoy!
