This is a tutorial on Locked Stitches and Double Chains, two simple techniques that can help if you find your filet blocks sloppy, out of shape and impossible to block. The locked stitch technique creates a structural fabric, that puts the stitches in the right place from the start rather than hoping that blocking will improve things. It neatens up patterns and pictograms and also stops the crochet spreading wider. Double chains help with tension, and the post has a discussion of how and when to use the technique