One of the screws holding the regulator to the door sheet metal serves as an "adjustment." When you install a regulator/motor assembly, using this screw you can adjust between won't work and works smoothly. I'd propose "out of adjustment" is more likely than "broken tooth."
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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
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