I've used a tailor's clapper (which I think is the same as the quilter's clapper) to flatter seams with lots of intersections to get rid of the bumps. I guess you could use it to keep 1/4" seams open. I've never tried.
Edit: I just went and looked. WAWAK seems to have a good price on them.
Last edited by cashs_mom; 03-13-2026 at 04:40 AM.