I finally had a chance to clean up the original master cylinder. I've pored over Duane's date code book and can't figure out what the code is. Maybe someone can chime in or maybe there isn't one? Duane?? Also, has anyone ever rebuilt one? It doesn't seem overly difficult, as there isn't much to it in terms of parts. I've also seen some YouTube videos depicting rebuilds and am wondering where guys are getting rebuild kits?