Sun MDT distributor tester

@halifaxhops I picked up the manual he found. It is from 1948 and from that I learned there are 2 D cell batteries in the machine. When I took the caps off the bottom was ok but the top battery was all rust. I was able to pull it out but the holder is rusted away. Is there a fix for this?
Have to change them out Mark at Paramount has them, also check if the covers are warped. If so the rivet wont hit the ground on the machine look at them you will see what I mean hard to explain.