Posting this early because I will be out of town for a couple weeks. This is the gauge I made for JordanP, padauk and poplar. Iron is made from a hex key. If I were to do anything different, I would cut the round mortise then glue on the padauk with just a small hole for the iron but live and learn. The threaded insert ties the mortise and tenon together (they are also glued). It worked like a dream. Will mark to a depth of about 2.5". Hope you enjoy it Jordan.