Thats probably the secret for these Arcam /Alps switch banks.
With an added rubber drive band stage it now works
reliably. If too much added gear ratio then it will
time-out going from extreme positions 1 to 6 or 6 to 1, though.

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