I came up with a way to remove the valve out of my FX bottle without a spanner wrench. I found a large socket in my tool box that I believe was a engine sending unit removal socket. I've had it for years and don't remember every using it. I started out by opening up the ID so that just the valve would slide in, drilled a hole that would match up with the hole in the valve. The photos will explain it better probably. I just snugged up the socket in my vice and unscrewed the bottle by hand. Sorry for the huge photos.