I refill my lighter every morning before I leave. I’ve never had a problem with it running out of fluid. As for the flint I just put a spare one under the felt pad. And I don’t need a tool to loosen the flint spring because I just screw it in hand tight with my fingers.
£11 on Amazon UK. I'm going to get one. I currently use a tiny glass bottle that had essential oil in in, which I carry in my bug-out handbag for emergencies.
It looks like this could also be used as a 'charger', Papillon-style. Just remove the clip, large split-ring, flint holder and screw tool. Perhaps attach a short lanyard to the small split-ring for easier retrieval 😐
Interesting that Zippo doesn't care about the construction/consistency of their fuel canisters. Mine is more of a "dull satin chrome" finish like your cap. You seem to have a "polished chrome" bottom tank with a "dull satin chrome" cap. I've seen full polished chrome canisters & full dull satin chrome canisters. Never like this