Since I am not the worlds most accurate at cutting I ALWAYS cut larger on hst's. if it says 3 7/8 I cut 4 1/8th then trim back and it works. Learned that a year ago on the quilting board when I had the same trouble my fellow members in the boom 8 taught me a lot of cool tricks. that is one of the best ones. easy to trim back not so easy to add to it.