Another message from a Whitehorse Mountain Green Springs Spinner owner! I am as amazed as their maker, Dan Yeager, was to know so many people out there still have these wheels. This question was in regards to the tensioning system. Here is a close-up of one of my wheels with the short flyer and bobbin. Does this help to explain how the tension should work? The L-shaped arm with the round disk attached has a wing nut that holds it to the back of the upright; you can loosen or tighten the tension on the driveband by bringing the disk in contact with it. Ingenious, but when I mentioned it to Mr. Yeager, he shrugged it off as “early Industrial Revolution stuff.” Well, it’s ingenious to me!