Does anyone out there know anything about an older Jaguar Piccolo Technisub speargun. I recently acquired one through my grandpa and I am having trouble getting it to work. There needs to be some way to insert Co2 into this thing and I cant quite figure out how this can be done. Is there supposed to be a cartridge that it comes with or does it take the ones that can be discarded after each use? If anyone could please provide me any useful info on how to get this thing goin it would be greatly appreciated. Thanks