Well a couple years ago, cj428mach (Mike) and I were talking about the 4lb caged lower pulleys. We both had some good ideas, and left it at that. About a month ago, I decided to attempt to make a version of what we talked about. I was able to locate a piece of 6061 aluminum tubing with a 8.5"OD and 7"ID. Let me just say they are very proud of that stuff! But anyways I got it in and started making chips. What I did was machine off the ribs on the factory pulley, and made the new ring interference fit into the existing pulley. I then bolted the 2 together with 6 bolts. Final dimensions show about a 8.400 OD, which is probably closer to a 3-3.5lb pulley. Here are a few pics.