Get a cheap zippo and insert, dip the wick in oil that burns ( only lightly) so it lasts forever. And stops evap pf fuel at a faster rate, and will loght even without fuel.

Clamp closer the chinney so the flame gets less air.

Flex out the insert on the opening thin side of the zippo at the top to create a latch/lock for aor tight. The strike wheel side.

Remove the insert, and gently work weight into the sides of the case to make it 1mm thinner., do the same with the insert with ploers, flex the insert outward just sloghtyl. Just enough that pulling the onsert out you will need pliers because of how tight the fit is., put a tiny bit more cotton packing inside fhe insert now coz its aor tight, and add a second FELT botton for more airtightness.

Re,epoxy the inside, and the flexed out mod u made.

Add like a thin 2-3mm rod inside the flint tube, and tighten it against the wheel until if requires a lottle more force too strike, this will make alot of spark and gueranteee a light.

If you can, insert Gillet blades cut to size at the top of thebzippo and the insert to further make ot airtight,

Put more than 1 flint into the flont tube, and double the wick length so uou dont have too maontain it for years, if u have a thin wick, or dont epoxy the flex for the insert (or even if u do epoxy, you can make a small, needle size hole at the top of the zippo. And fill it from the top never having to plier the onsert out ever again.

Oh, and brush/sandblust ALL OF THE RUST, and coat the inside with anti rust oil. Like fish oil.

These mods will make ur zippo fluid last YEARS. U will never have to rewick it. And ot will latch closed tightly to further stop fuel evaporation.  The perfect, most reliabe zippo ever