Probably, but I'm not that good! I've had bad luck by over-complicating molds. It seems the simpler I make them, the better the turnout, even if I have to drill a few extra holes. In a couple of swimbaits I tried a brass tube rattle chamber, but between the resin/filler being pretty dense to begin with and the weight of the tube, I had troubles being able to add any weight without sinking the lure like a rock.