I know the feeling! After all this time (How many cylinders do you own?) I've only gotten rid of my three Catalina Alum 6 cylinders and my OMS (Faber) LP125.Updated
I finally sold a tank but only to end up getting 4 more!
...
But purchased two new Faber LP50's.
Turned one of my Luxfer Alum 40's into an oxygen cylinder (dedicated to emergency oxygen, rather than to deco), though.
rx7diver