> Also, knock off's are designed so that forward motion of the car will 
> tighten them, not loosen them.  So when a wheel spins forward, the knock 
> off will spin the opposite way.  So, to take a knock off off you need to 
> rotate it in the same direction as the wheel going forward.
I was with you right up to this last paragraph. Como se dice en ingles?
Ray Gibbons