I have a z-plus 2.0 in an heirloom zippo that my dad used back in the 70s. The original internals were taken at the airport some years ago. The insert didn't work very well at first but after a butane purge and refill with good fuel it works like a champ. It was a tight fit and took about 2 hours to get it back out of the zippo the first time, but it's loosened up just enough now after messing with it some.