I was thinking of car parts that could be made into weapons and I came up with the idea of a piston and rod
assembly modified into a flail. I got ahold of an old piston and rod assembly from an engine rebuilder and cleaned it up.
I then welded it to a chain and the other end of the chain to a steel pipe.
Here it is being wielded by the lovely Belle Chere at DragonCon 2009.