Please then ..... tell me how to remove the hand wheel. I have tried twice ... I take out the screw, unscrew the silver cap, take out about 4 washers, and then, well I don't want to pull too hard, but I can't get that wheel off. Does it need a spray of tri flow or is there another screw that I'm missing. Please advise, I would be so grateful.

Which is more rare, the aluminum or the cast iron 101 ?