I had been having slow shifts with a rear Sachs New Success derailer that I bought on eBay, so decided to take the pulleys out and clean and lube them. I soon noticed why my shifting was bad when I saw the guide pulley was wobbly, made by simplex, and missing the side plated that cover the bushing. I had some sealed bearing aluminum pulleys in my parts bin so I cleaned them up and installed them. Once everything was back together I made some adjustments to the cable while shifting through the gears and it seems to be working great now.