The present invention provides one pulsewidth control loop device with complementary signals. A rack bar extends longitudinally through the housing and is connectable with the steerable wheels of the vehicle. The apparatus is provided with a plurality of pairs of removable support rods, each pair having different lengths to accommodate varying widths of bow making material. The synchronizer receives the input reference clock and the jittery input clock, and generates there from a synchronized input clock signal with respect to the jittery input clock.