Bosch PBS 60, belt sande
 

Replacing a seized bearing , no problem there.
The gearing is a helical pinion on the motor shaft driving a large spur
wheel.
There is no trace of grease in that "gear-box" , why no grease ? because
helical tooth-form ?
Pinion is steel and spur looks like nickel plated steel

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