Blades came from Stamina. Chopper blades is what they call them. You'll need a good slug of lead in the belly to make sure the blades do not cause the plug to roll when ripping across the surface. Make sure the thru-wire is not tight at the tail end. Also include a bead or rivot in there to insure the blades will spin freely.
JPI, sounds like a buzz saw coming across the top
Jigman