Does this pot exist?

--Howdy! I've been fiddling around with using a pot to position a "servo". I'm using the teeny weeny one from Parallax that needs to be turned with a screwdriver. The application is to drive one of those surplus windshield wiper motors; I'm using the PWM output to send signals to a Victor motor controller and this is working very well. --The trouble is determining, with certainty, that the motor is in "neutral". What I'm trying to do is use the motor as a winch to move a small load up and down on an art car I'm building. The winch will position the load one way when the vehicle is in motion and in another when it's parked. Although it's tempting to use a DPDT switch, I'd prefer to control the rate of the load's position change with a big, easy to grasp knob on a pot that could be located a few feet from the Stamp. --What's needed is a tactile feedback of some kind so that I know when the motor is in "neutral", so that the motor isn't creeping. Text and photos of project to date at: