I have a classic single serve with a 46 oz. reservoir tank. I did the paper clip, the vinegar, the burp, and still not enough water came out for a cup. I did not want to take the bottom off the unit. Finally I removed the tank and saw the three screws holding a screen filter in the bottom of the tank. I have small hands and probably could have gotten this apart, but I questioned the reassembly. I turned the tank over and saw this was a spring loaded release from the tank to the machine. Another reason not to take it apart. I pushed in the spring load and ran water through the tank, reversing the flow of water. When I held the tank up to the light I could see some of the debre had come lose. I kept this up until the majority of the screen was clear. I now get a full cup and the machine no longer sounds like Eeyore as it pumps water. Not sure I would run a denture table through the machine, but I might use it as a stand alone in the tank if this persists.