I'm not sure what size pins are now in use with this crankset. I will have to remove them to take a measurement. I do know that the left crank arm keeps working loose and the pins look fine. As to the size of the pin and how it is used listen to Maria Muldar on track 4 of "Meet Me Where They Play the Blues". I'm sure that this song has been done by many others.
Paul Patzkowsky Longmont, Colorado