Still having problems with the cylinders not retracting. I think I found the soloution this morning thou, with a company in CA. They have piston cup seals that start at 3/8" so I ordered some 3/8 and 3/4 that should be here in a coupe of weeks. Have replumed out all the Hydraluic lines with bigger size tubing too, so I have more oil flow. I guess time will tell if it works out or not.
Rob
http://www.allsealsinc.com/ukp.html