First time using the take up reel(Roland TUC-1) on our SC-545ex, but I'm having a problem with it actually taking up automatically. It works fine with manually pushing the button, but will not automatically wind. I've attached a pic. Do I have it webbed correct? I can't locate any manual for the TUC-1. It doesn't seem like it should be that difficult. There is a sensor on the bar in the rear pointing to a reflector on the front of leg. I assume when the beam is broken, the unit is activated, correct?