The beauty of Zippos is that the cases last forever. I'm using a case my late father used when he was in his 20's.It has a picture of the statue of Liberty on it which has practically worn off but it'll last for another 50 years and beyond.
I also confess that sometimes, as fuel is running out, I've actually rested the lighter on the rim of the pipe and NEVER scorched the rim. Zippos just work.
By the way, I've used the same insert for 10 years now and never changed or even adjusted the wick. Has anyone, ever?