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I've remove it and cleaned it, and tried an alternative and both do the same so it's something in the set up somewhere rather than the parts per say I think, unless it's the chain that is
jeff80-
Jeff 80.
The jumping problem sounds to me like an incompatible chain and sprocket rather than a malfunctioning derailleur. Even the best modern mechs won't stop the chain jumping when there is wear on the chain or the sprocket, and jumping on one sprocket is typical, since it's the most worn one that jumps.Of course, if you're using a new block and a new chain then I'm wrong, but if one is new and the other is not this could well be your problem.
Skülly
clubman
The flat coiled spring was good at grabbing mud and creating a grinding compound. I wonder if there is any wear inside the windings of the spring causing friction, or just enough to make it hessitate to accomodate the next cog - did that make any sense !?