You guys were RIGHT. It was the detent balls and spring that were rusty/nasty. Of course I first took the whole control valve off the machine, dissasembled it, cleaned it with brake cleaner, pressed it back together, reassembled and reinstalled on the machine. When I could have: (KennyD, I have the 30932CAV not the 30932CBH but you pretty much have to take the thing off the machine to tell the difference) 1. pried the dust cover cap off the end of the sticking valve, 2. tapped the end of the valve with a punch to release it, 3. sprayed some WD40, brake cleaner or Kroil into the orifice to clean out the nasty gunk, and 4. Greased the orifice full, work it a few times and close it up with the dust cover. All this without taking it off the machine. Live and learn. Thanks all.