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How to turn a disposable lighter into an oil candle
Get a disposable lighter that is empty
Take off the flint wheel holder by prying it with a screwdriver or other tools.
Remove the valve by twisting it, you can use the adjust wheel for this.
Remove all the insides (the tube and a stopper )
You will see a hole where the gas would have come out of.
Get a filling tool, e.g. A syringe or tube small enough to fit it into the hole.