[klondike98]

Thanks guys!  I also got some advice from Phlogiston and decided to try his technique.  Starts off by grinding the crimped end of the can.  This can is nickel plated over copper so its pretty soft.  Grind enough that when looking sideways on the can, the curved edges of the crimp are gone.  I used a Dremel tool.  [WEAR SAFETY GLASSES] Then using the large nut and locking pliers you work the plastic/bakelite base out of the can.  I had to put the nut on and also turn it with a wrench a bit to start the base moving in the can.  Then I was able to work/pull the base out with a little grunting...ok, a lot of grunting.  The center aluminum threaded bolt and electrode comes out of the bakelite and will be replaced with a modern bolt.  Now for the second one ....

[Image: https://www.dropbox.com/s/9tf3kn4lrmrn0l....jpg?raw=1]

update: after opening the second can, I'd suggest NOT trying to turn the bakelite piece with the wrench.  There are actually two pieces to that part and you can wind up turning the one with out turning the other.  You can see them in the photo above just beyond the lock pliers.  Just pull the bakelite out.