I sometimes will take the seams out on the smaller block and resew with like 1/8 inch seam...and, my quilting guild sisters would hate me saying this...but, I have been known to spray and stretch, and press with iron...finally when all else fails, and my type A takes over, I redo the whole thing! :shock: When I am making half square triangles, I have gotten to where I cut the square bigger, and trim the hst down, otherwise mine never do come out the right size, square, and with points intact...good luck to you!