I know the mechanics of the Defender and Joust cocktail sticks are the same because I've been working on a Defender cocktail restoration. I searched the web and ebay for pictures to help me in my restoration, so I ended up with pictures of both control panels.
I had one good and one bad stick on my Defender, so I bought a set from a user here that also had one good and one bad ball top so I ended up with one good set. I still have the two extras, along with a spare set of hacked cocktail control panels that I don't know what to do with.
Both of my spares have rust on the mounting brackets, but are still useable. One of the sticks has a melted spot about the size of a dime, and the other has a similar sized gouge taken out of it. I don't have pictures of them right now, but I can take some.
Here are the reference photos I have that shows the sticks are the same: