open up ur zippo, then you pull on the cage and the caseing of the zippo should come off (it might be stiff so put ur back into it). Then at the bottom they should be a soft foam with a screw at on...
BUTANE FILLING
PREMIUM BUTANE IS REQUIRED TO INSURE OPTIMUM PERFORMANCE Of YOUR LIGHTER! LIGHTERS REQUIRE THE CLEANEST BUTANE AVAILABLE AT A PRESSURE OF 45 PSI. RECOMMENDED PREMIUM BUTANE BRANDS ARE...