Hi Gang , I would like to know how to put 2 caps 7mm and 5mm into one cartridge , the marushin car 15 I have apparently requires 2 and im not sure how to fit them !! , also I have an MGC mac 10 ingram with the early style , I think , open carts , and it is not firing on full auto , well ok its not blowing back , its going phut , but no blowback !! , any advice will be appreciated , thanks very much , Richard