Dan Armstrong Pickup Thumb Screw
What's remarkable about the pickup thumb screw is that more of them don't get lost along the way. When they do get lost, you're pretty much out of luck. This one came on the market as a result of A2160D getting parted out by the owner. This item sold for $41 in July 2012, and I'm still kicking myself for not bidding higher. You have to plan ahead when you see DA parts come on the market, so heads up!