-JdK- The nuts at the ends of an OHC camshaft are a constant challenge within the vintage Norton scene. I like this method. Mike in California came up with this improvement. Mike: "I like this jig but just wasn't happy with the slot engagement for the square end of the camshaft. It wasn't easy but I found a half inch drive socket with a 7/16" square driver and made my own jig with what I believe is an improvement"