Yes. I wasn’t trying to be pushy about it. But apparently, flint hardness is matched to the flint wheel and flint spring on the lighter. Corona designs theirs to use a slightly softer flint, as opposed to say a Zippo, who designs for a harder one with a more aggressive wheel. Consequently, a Zippo will eat up a Corona flint in a hurry; and a Zippo flint in a Corona could start wearing the flint wheel while producing a weaker spark.In a bit of irony, I use the genuine Corona flints in my knock-off Old Boy lighters.
Obscure little details.