I thought I'd pass this on. You know how you flick the stricker wheel of your Zippo repeatedly and it refuses to ignight? Providing you have a flint and fuel inside, the reason it won't ignite is the striker wheel is dirty, clogged with skin oils and debrie from your thumb. So just clean the wheel. Sandpaper on the wheel works well, or clean the grooves of the wheel by scratching the debris in the wheel's grooves with the tip of a knife blade or an awl or needle. You'll find you will get more reliable ignition strikes on your Zippo more regularly.