Small world huh!! I spend alot of time on campus working in the frat and sorority houses as an electrician.
Never even heard of Rocket Fizz, what is it?
Feel free to send me a message if you need help looking over the machine. It would be good if you can verify there are no valve leaks or other problems.
I worked for Coca-Cola for 22 years and these were some of the first dispensers I ever worked on back in the late 70's. A very simple machine which is pretty bulletproof.
Be advised you will need a crane to lift it. LOL!!
Here's a carb I found on E-bay which I could fix in 5 minutes, it's the preferred brand, McCann's. the same guy has a carb which has a seized pump that could be easily fixed but you could find a better looking one if you took your time and waited for the right opportunity or hit a local restaurant auction. http://cgi.ebay.com/McCanns-Model-43-5000-Carbonator-Carbonated-Water-Pump-/290526472843?pt=LH_DefaultDomain_0&hash=item43a4ba2a8b