My Quickie 32 single hydro has gotten slower almost down to a slow walk. I've adjusted the cables per the manual numerous times before with good results but it no longer seems to have an effect. I can go with no play in the levers or the recommended play and the drive speed is still slower than it has ever been. Can it just be the cables have stretched too much even though the lever on the drive system does not seem to have any more movement that I can see when the lever is fully pulled? Or is my transmission wearing out in such a way as to lose it's speed? 875 hours on the machine. Any ideas or anyone else having this problem?