Ordered some screws for inserts I already have, wasteboard is about .75 inches, 1.5 inches body thickness, and 1.85-2 inches for uncut body. Make two cuts for bevel and length. Wait for these to get in to measure the countersink holes. Also make sure it deep enough to clear the first surfacing cut. The inserts should help repeatability. The hammer video just uses these screws first, then cuts the hole for the dowels in the wood body. Removes body and then drill holes for the dowels in the wasteboard.