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Robyn, the small shaft in the nose of the crank is what drives the crank gear. The crank gear floats on the end of the crank on a bronze bushing and the two pins limit its rotational travel. I am assuming this was all done to damp out torsional vibration and prevent it from being transmitted to the cam drive gear train.
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I think i'm getting this now
The Quill (dumb bell) actually drives the gear and acts as a torsional damper,limited by the pins in the nose of the crank.
Sorry but i can now see thats exactly what you said.
When i read the Cosworth book a while back i remember it said the Duckworth used "Quills" to cure torsional vibration problems in the DFV engine.
Up till now i didn't understand what they meant but now i have a better understanding
Pheonix,Where did you get the impression that i'm a Twink man?