Mercury - Flo-Torq X HD Hub Kit Propeller Hub System 8M0182969. OverviewOn the V10 motors running a Revolution X prop, this HD hub is usually the one we end up installing. Joystick Piloting keeps that prop busy-quick bumps, little shifts, never really resting-and lighter hubs start to show it. The HD setup handles that constant back-and-forth without the drivetrain feeling jumpy or annoyed. Boats that use Skyhook a lot tend to run smoother with it too, since the hub takes some of the edge off al