Who's familiar with 600c tabs?
 

One cylinder is moving much slower than the other on one of the tabs. I took the tab off to refinish it and ran the cylinders up and down and noticed one lags behind the other by several seconds. The cylinders on the other tab both move at the same speed. there don't seem to be any leaks. How do I diagnose and fix whatever is wrong?

Brian, it might not be a problem. Unless they are connected together by the tab the one with the least friction will move first/fastest.

Ok. Hopefully that's the case. The twin tubes on the other side go in and out at the same speed so I thought there might be a problem with this one. I was worried something was wrong with that canister thing in between the tubes. I'm sure that is almost made of unobtainium by now.