I recieved a Syphon brand soda siphon from Williams Sonoma as a gift some time ago. I cannot figure out how or what I need to do to make it work. The instructions are utterly incomprehensible and Williams Sonoma no longer carries the product so no one at the store can explain how to make it work either. If any one has any idea where or what size cartridges (can I use co2 bb gun cartriges) I need and where to get them, and then what to do with them before once I acquire them, it would be enormously helpful. I would greatly appreciate any info on making this erstwhile gift work.