[Gdeaver]

Actually you can use the motor to hold the surgical tubing pulled back. That's what we did this year. We used a cim but could have used a mini cim. Used the parts from a Andy Mark shifter and added one more reduction stage. Used a force sensor to measure the pull back force and a PI to hold at about 120 LBS of tension. The holding current was surprisingly low and the motor only gets slightly warm even after extended run times. Only problem is the Andymark dog design has very little contact and the dog and gear wear. They have to be replaced periodically. Benefit of the design is that we can just kill power and the ball is just released with out shooting. At the end of the match the shooter is not in a cocked state. good for safety.