I now float all my tops (ala Sue Patten). I don’t use the c-clamps to hold anything, I use them to mark where the inside border passes under the front roller(where the top would normally be rolled on to). I find I have far more control of how snug the top lays when it extends forward and over the backing bar. I find when the top is rolled on it’s bar, it has too much slack right up against the bar and I found myself basting that down with every turn(ala Sharon Schamber). The end result of all the trouble shooting was floating my tops. Every single one! I remember telling my students six months ago that I float about half my tops. Funny how things change. In the end, all you can do is try every method and see which works for you. If the end result is the same, who cares how you get there.