How do you put an airsoft revolver back together?

I have a UHC gas powered airsoft revolver. I took it apart to do a repair but am now stuck trying to put it back together. The main thing giving me trouble is a spring that I cannot find its position. I have the firing mechanism semi working except that the double action doesn't work and the chamber won't spin. Any help would be appreciated especially if I could get a picture of the inside of the gun put together the way it's supposed to.