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...
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open the lid, pull the lighter out of its casing, get the felt pad out of the way, pour some lighter fluid on the cotton, wait to let the cotton absorb it, and do it again once or twice (but don't...