A clapper is indispensable to home sewers, but, I have used it many times with stubborn seams intersecting in the middle of a block wanting to pop up like a bubble. The clapper is placed and held down onto the backside of the fabric seam after heating it to the point that a scorch would occur if you leave it any longer. You lift the iron and place the clapper sharply onto the seam and hold a while to hold the heat in and set the flat seams in place. I personally love the smaller size of the clapper and I can't see using a float because that is foam. You need a non porus hard surface to hold it as flat as possible. I bet amazon or a good sewing store would sell them. I have had mine forever and I can't imagine being without a set of woolen sewing hams and a clapper.
Last edited by RedGarnet222; 10-12-2021 at 10:39 AM.