What is the worst pump you have ever had to work on? This could be anything, like maybe the thing was a total wreck before you started working on it, or the fit and finish was so poor, or the pump itself was just terribly designed and built.

I ask because I'm working on a Wayne 500 right now, and one door was so bad that I spent about 5 hours trying to get it straight. Also, I'm not too impressed with how this pump is built. It seems really cheap compared to the Model 80 that it replaced.