i figured i would share the knowledge so that more people can try to save money. if i can ever find the butane, i will do it as well.
"When it is empty take a pair of needle nose pliers,pull the brass out the top of the cylinder(try not to ruin the o-ring),under that you will see a solid white piece of material,poke a hole with a needle in it.Push the brass back in.Get one of those KING butane cans with the different tips.Find the tip that fits in the brass.Cut a very small v-notch in the tip of that.Place the butane cartridge on a table,and insert tip of KING butane can in it.Press down.You can now re-fill your bottle any time."