Walt, your designs are getting so much better with each knife. One suggestion that I think would be a breakthrough, as well as making your life a whole lot easier: a file guide. I know the ready made file guides are expensive, but there's a super cheap work-around. A set of 1-2-3 blocks and a couple of bolts. Not nearly as sexy- heavy and a little cumbersome to use at times, but for $15 it will work wonderfully. You can use it as a guide to keep your plunges clean as well as getting those shoulders just right so that you don't have to file and refile the angles on your blade and handle 1000 times to get rid of any gaps and non-matching angles.