One of my guild members spent an afternoon working with anyone interested in perfecting that elusive 1/4" seam... turned out, a major part of MY problem, was my PRESSER FOOT!!! It wobbled as it sewed, so no matter how careful I was, it was WRONG... I sewed on HER machine and my piecing was PERFECT!!! sooooo.... now, I use a different foot on my machine, and it is much better...