Varomorus Wire Tensioner Table System for Beehive Frames

This comes with no instructions whatsoever. There is no on-line video either. It claims to be adjustable for all frame types, but either this simply isn’t true, or there is some closely guarded secret way to do it beyond a few millimeters along the horizontal dimension, using an awkwardly positioned screw at one end of the cross bar. Even with a frame that more or less does fit, the frame slides out as soon as you start tensioning the thing. A total waste of money as it is; the only useable part of it is the wire holder and crank. I would welcome instructions of some kind.