The small ones found on audio mixers , especially for the small slplined
shaft ones of about 4.6mm. A nice random selection would be nice , to match
up for missing ones.
Just a brand name or generic term for them would help googling.

OT: Anyone tried the son of Google - Cuil.com.? Beautiful black text on
black background for the searchbox is what I get on Firefox.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/