While at a quilt show a few years ago, there was a booth set up. The fellow was showing how to make the seams, as in a windmill block where all of the seams meet up at the centre, resulting lots of bulk, less bulky. He was selling a hammer, that he used to whack the centre of the block. I could not see spending money on one, when I went home I did some looking through the hammers around here, found one. Now, when I have a bulky seam, I give a whack to the centre bulk, iron it and it is flatter. The tool with a case was over 20.00 at the time, not sure if they are still out there, have not been to a quilt show lately. I should mention I do this on my carpet floor in the basement, if I have a good number to do, I go get my cutting board, but always do it on the floor. It does help with bulk.