The parts I changed and added to the Garrison & Bellinger designs are the cradles, amount of weight needed and most important, the angle that the binder thread approaches the drive belt spiral. Please note that the belt only goes over the right hand cradle. I don't know if you can see it or not in the pics but the thread approach angle is parallel to the belt spiral. This really made a difference in smooth performance. I've never or have needed or used more than 13 oz of belt weight and I think that is heavy. I can adjust enough thread tension to break the heaviest thread with any weight I use, 3 - 13 oz. The Garrison needed weight to keep the continuous belt from slipping, thus causing twist in the bound sections, this design doesn't. So less weight is better.  All the weight is needed for in this design is to keep the slack out.