Here are the sites with all the answers:
http://www.paulivester.com/films/projector/b&h_belts/b&h_belt.htm
In that article you will see: "Believe It... Or Don't!
Tom Hudgins, a highly respected film collector and dealer, reports that he has had success with cutting the belt and gluing it together. The only adhesive that he found that works is Bondini No. 2. In a pinch, he has been able to fix a loose belt by removing a short length, and gluing it back together. He has been running a projector this way for a long time, and the belt hasn't broken yet!"
RJS
February 2009