Hello, Mr. Rawles:
I'd like to share a hint with you and your readers: Save all of your empty (discharged) disposable lighters, such as "Bic" brand lighters. They contain flints that you can use in your Zippo lighter. [These lighters can have their striker mechanism quickly broken down with a pair of pliers.] These are longer than the replacement flints that are sold in stores. They also work well in the older Coleman lanterns equipped with flint strikers.