I used a couple laser lights on my quilt frame to make sure the bottom border is straight across the frame.....or near straight. I also have a metal "L" ruler I slip into the slot on my deadbar to make sure my sides are staying true to straight. At times I'll check my blocks too with it. Also use the magnetic tool bars to hold my quilt onto the belly bar when I float my quilts. I have a couple clamps from my workshop I keep on my batting bar for when I go to cut a piece from the bolt. I use a long metal ruler across my cutting table and clamp them with these clamps to hold it straight while I cut across.