[tubman]

Notice the word "favor" was in quotes on my original post. This sleeve seems to be at least 1/16" thick. Perhaps his improved one piece seal uses a sleeve analogous to those used on the later vehicles. If so, that would solve a lot of problems. These guys have access to parts us "normals" don't know about. I'll wait until I get the proper pulley and then make a final decision (which may involve tearing it down and using a rope seal).

Thanks for the help guys; this has been very enlightening.