Made this one myself. Of course if you want a Woodpeckers version see https://www.woodpeck.com/exact-widt...48647707&_bta_c=eeuhyak0rn8nm2gusuxewuo02ctgkPix helps me work out a project. Here's one Mike posted. I think the only really critical part is getting the fixed end pieces connected at an exact 90 so the dado is 90 to the workpiece edge. I usually add a couple of pieces of paper when setting the width, to give a little room for glue.