[DanEC]

I'm a little concerned over some of these spinner adaptors being used with a breakover bar. I know on my 66 Corvette the factory torque design for the hub/spinner is 450 ft lbs. I would suspect it's not much, if any less for a Cobra hub/spinner. That takes a pretty long bar for the average person to get that high. A good pneumatic impact gun with an adaptor would get there. Of course no one knows how tight a 6 lb lead hammer gets it without some testing but I suspect if your tighten them until you hear the sound of the hammer blows distinctly change to a hard metallic sound - it's pretty high.