Originally Posted by
onehundred80
A picture is worth a thousand words, you can see both ends of the shaft and each end has the hole. The driving disk with the six driving pins in it uses the six pins to drive the plate with six holes in it. There is a gap between the disks and the air moves through this gap.
Again, great pic.'s, but still doesn't explain how the hollow bolt has anything to do with that. And again, is Rob wrong about this? If you are right, then Rob got it wrong; Right? See his explanation of the SC pulley bolt @ Needswings.com.