I've had an idea for a mace for quite some time, but I never brought it up because it would be truly lethal if used.I'm sure you know that some of the weapons truly are dangerous (sharp and heavy) but if you want 'em, you got 'em.

Anyway, Use the pinion gear from a truck differential, slip it into some tubing that has the same ID as the OD on the shaft of the gear, and possibly have a trailer hitch ball at the other end. Wrap the handle in leather.
I thought of this while doing warranty parts recovery for Ford, the trucks from about '06 or '07 would love to demolish the ring gears for some reason
