Has anyone successfully changed out the rod in a mag # pump?

I broke the shaft somehow when I opened up a Mag 12. Has anyone successfully changed out one before with the rods from a hobby store, as mentioned in a couple other threads?
 
Thanks! Like in the picture, mine is broken in the same place. (you can still see some of the rod in the end cap.) How did you manage to get the rod out of the cap? Any advice you could give would be greatly appreciated!

Cory
 
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