Yeah, I just went and pulled a top for the 411G. The front one is the inner knob. Put it down and you have a better chance of the back one moving. If it's fully at the top, it tends to "jam" that whole mechanism from letting the other side turn. Ditto if the left (back) one is all the way up.
I shot some video of what these look like when they're operating, and am going to try to figure out how to upload to YouTube.
Last edited by ArchaicArcane; 03-24-2013 at 01:02 PM.