Piper single axis autocontrol question.

My '74 archer developed an intermittent problem where the aileron would have
a 'soft stop' at one end of the control throw. I thought a mechanic might
have left a rag or some such under the floor that moved around and sometimes
prevented full control deflection, so I removed the floorboard under the
back seats. I found instead that the aileron servo pulley had several wraps
of cable and what appears to be a pin stake to keep the cable against the
pulley, presumably to prevent the cable from sliding on the pulley. At one
end of throw the pin stops the cable from unwrapping from the pulley and the
cable bends down, giving the feel of a soft stop.

Anyone familiar with the mechanics of this arrangement? My best guess is
that the cable is actually sliding around the pulley slightly when I help
the autopilot in rough air and sometimes the pin is in a position to allow a
natural hard stop and at other times it stops the aileron short of full
throw.

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Best Regards,
Mike

http://photoshow.comcast.net/mikenoel