I have a TP 960 sand blast cabinet that I got from a friend. I put 75 lbs of #80 glass beads in it, and it worked well for about an hour or two, after which it has almost quit working. I pulled the nozzle in the accompanying photo out of the gun in the unit, and if you look at the 12 o'clock position, you can see how it is worn. The other two pieces in the pictures were in a plastic bag that came with the unit, and I believe they are used in the blasting gun itself. However, similar pieces were not in the gun when I took it apart, and these pieces don't seem to logically fit any place (e.g. the black rubber washer is too large by far to fit into the gun). I know I have to have a venturi effect for the gun to work properly, and the TP catalog shows replacements for these, but I can't figure how everything goes together. I have looked on the TP site and googled a few other sites, but I can't find any information on how everything fits together. Anyone out there that knows how this all goes together? BTW, I also got a couple of unused nozzles in the plastic bag that are not shown.