I am part way through rebuilding the swivel ball on my IIA. Among the other items, I ordered a Railco bush as well as a wafer. It seems there was what looks like a wafer in the bush when it came. Do both of these get used or did I buy the one as an extra?
Also, are there any real tricks for inserting the top pin into the bush? Even with oil on it, It seems like an overly tight fit and wants to scrape the side walls of the lining. I put the pin in the freezer overnight with the hope that will shrink it enough.