| | Re: Small Co2 cartridges?
In my surfing I have seen the ones you are referring to and if I am not mistaken they are not regular co2 cartridges but a special cart. designed for that set-up. I would go with the previous posters advice if you want a cleaner look go with paintball canisters.
I too am sorry to hear about your knee, I used to work in sportsmedicine and physical therapy so I know the pain your in.