Don't have air, at less not compressed air. Vacuum is not a strong enough force to hold it, not on a vehicle anyway. Found an electric one at "Ball's" for less than $60.00. Streetworks want almost $100.00 and they look like the same thing. May have to invent one. Something like a small DC motor with a fex shaft attached (like a speedo cable). Just drive it to "stall", should work with a polarity reversal switch, center position off. That way I could mount the motor just about anywhere.
