I asked this on another thread but it didn't get answered so I'll post it here. How do you guys tighten the knot at the top for the first cross? Using a starting knot works because you tighten that by pulling tension on the second cross but how about tightening the knot when you start the crosses with a starting clamp? When I try to tighten the knot, the bracket thing that goes on top of the frame gets in the way. Has anyone figured out a way around this?