Someone posted a tip about keeping block pieces together to stitch them without having them shift. The tip: Use glue sticks like those school children use to glue paper together. Put a little glue stick on the seam allowance of one piece of fabric and align the other piece on top of it and press together with your fingers. When you sew along the quarter inch allowance, the fabric will stay aligned correctly and won't have the pins in the way. Also, the glue won't gum up on your machine needle.