Originally Posted by
dinasrt
Great pictures, but they still don't explain how the hollow bolt does any kind of venting of air "to escape", as you say. You didn't answer any of the questions; as though we are to figure it all out from the pic.'s? Are you telling me that Rob at Needswings got it wrong? How does a hollow bolt that leads to nowhere work? Trying to figure out your theory here Dave.
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.