[chris37]

Head goes in there, chin on the flat bar, then slowly turn the crank until it cannot be turned any further.

I'm not even sure that would be justice enough, in fact, I'm positive that it's not even remotely close...

[JaguarXKE]

How about this: Nail his scrotum to the top of a telephone pole. Then pour hot lead in his arse until his nose touches the ground.

[headstamp 2]

“Head goes in there, chin on the flat bar, then slowly turn the crank until it cannot be turned any further.”

A 3 foot piece of 2” iron pipe slipped over the crank ear should give enough leverage also.