For just the odd missing screws/bolts situation.
It looks like the solution to this problem is someone in the UK to tie up
with someone in the USA and a packet of assorted small size UNC/UNF nuts and
bolts go surface mail one way and a packet of various small size BA mainly /
mm nuts and bolts goes back the other.
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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/