Chain Tool Replacement Pin

I broke TWO chain tools this weekend. On my cheaper one, I bent the handle, and on the expensive one the pin just sheared off. I think it's this tool, although Park has a couple that look very similar. They sell replacement pins but they don't look exactly the same either - on my tool, there are threads between that little nut thing and the pusher-pin and on the replacement versions the threads are on the other side.

So, the question is, has anyone done this and what are my chances of success and what do I need to watch out for?