Ok people. I have this junk 20" wheel tricycle that has been sitting in the weather for no telling how many years. Fortunately everything still turns but barely. I was thinking about using it for the build off but I have a friend that wants it and I will have to accommodate him during this and I'm building me something too so I'm out of this build. Anyway I have googled to find a rear sprocket for this bike and haven't had any luck finding someone that carries them. It looks like a freewheel sprocket that is pressed on a single shaft that runs through two axel housings from wheel to wheel. Any suggestions on where I can find one and how to get this one off?