McMaster also sells a
Welding Kit for Urethane Belting which includes a unique clamp. This clamp holds both ends of the belt together while the belt is mounted on the pulleys. A modified soldering iron/plate is inserted between the ends (which melts both ends at the same time), then the iron is removed and the clamp squeezes and holds the melted ends together (note that while the belt is under tension, the joint is not while cooling/curing). After sitting sqeezed together for 5 minutes, the belt is supposed to be at partial strength and the clamp can be removed...just trim off the flash. The belt is at full strength in about an hour...or less in an emergency.
Please note that we did NOT pay the $700+ that McMaster charges...I don't recall where we got our kit, but it was about $100.