Does anyone here have any experience with the barbed hinges and the saw blade and arbor that cuts the slot for these? Just curious as to how well they work. I see they are avialable from Woodcraft for about 40.00 for the arbor and blade. I think they are designed for the drill press. I read in one of Doug Stowes box making books that he uses one in a router table and uses a jig. Just curious what you guys think of them.