Send all yer Zippo's back to Zippo and tell them ya need pipe chimneys. They will do any needed repairs, and add a pipe chimneys free, to all yer Zippos. They send the original chimneys back, too.
Thank you very much for posting this. I had completely forgot that Zippo did this, and my favorite bright orange zippo is lacking a pipe chimney, and all of my other zippos seem to have disappeared during my last move.