Turning a blunt point to a 5mm nylon bolt, in a pencil shsrpener, and fixing
the bolt head in the collett of a powered engraving tool, with a 5mm back
nut, makes an excellent vibration fault indudcer. You do need to use phones
via an attenuator to monitor the audio out, over the engraver noise.


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