Thanks Bill... Argh, my ventilation issues are still ongoing, but working around them by using my modified Gong carbon mast with the Axis fuse, which works great, so not touching the 19mm Axis. Still using the Gong V2 Alu mast for my Gong foils, which is very sensitive to ventilation depending on conditions (the other day it was pretty solid on Port tack but a bit of a problem on Starboard for example), but I can just about make it work well enough, although I'd be looking for an alternative solution if that was my only setup as it would be too much of a compromise to have to deal with all of the time.