I have CF and aluminum lids that both fit (not a snug fit), but the aluminum is half the wt. so I went with it.
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I’ve done a lot of these UL mods but typically just bring my first gen JB burner and the UL stuff as a complete backup. Have you looked into a Ti/Flint “sparker” rather than the light? Would definitely save some weight over the mini Bic. I can dig mine out if you would like a pic.