Time again for someone's heirloom. Cured the main problem of erratic speed - solidified grease on the main swing arm , stopping the thin moulded hard rubber?(dark brown colour) edged pulley, freelyly swinging and engaging with the stepped conical motor bobbin with the pull in of the main platter drive band. But there is an intrusive noise associated with this pulley , once a revolution. Nothing obviously wrong , no cracks, bulges or anything on this edging - anyone know what it might be from ? All I can think of is the edging has worn to the point that at one part of the edge that it is very close to the underlying metal. I'm thinking of a fudge of trying a wide rubber drive band, stretched over the edge and secured in place.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on