80 is a specially shaped steel plate which is strategically located on the main plate 37 at the opposite end of the shuttle pin 71 from the drive wheel 16 to control the engagement and disengagement of the shuttle pin 71 with the drive wheel 16 and maintain the bend arm assembly 17 at the point of maximum rotation during bending operations until the clamping force of the pinch roller 44 on the workpiece 90 is released the program control plate 80 broadly includes a glide surface 81 a retainer platform 82 and the ramp 83 in describing the operation of the program control plate 80 in conjunction with the entire operating cycle of the bolt bender 10 it will be necessary to refer to fig1 and 11 in relation successively to fig3 6 in starting position as shown in fig3 one end of the shuttle pin 71 is oriented under the teeth 24 in drive roll 16 and the opposite end of the pin 71 abuts the lower portion of the glide surface 81 as indicated at 85 as the bend arm assembly is moved upwardly by activating hydraulic cylinder 68 as described above to clamp the workpiece 90 between the pinch roller 44 and the drive wheel.