I just got my hydrovac out and I found one of the tabs on the top piece that holds the J-bolt is broken. Looks like I will not rebuild this one. I think this time it would be easier to go with a reproduction. Check out this site someone else posted,
http://vehiclesofvictory.com/buying-selling/reproduction-to-parts/Let me know if you see a problem with this unit. Not sure what a series three is. By the way, no id tag on mine.