ljpm
Contributor
I don't understand why you're trying to change the mind of a stubborn old boat captain who has done the same thing the same way for reasons that to many might seem ridiculous but to him make sense- because there's no way he's EVER going to listen to your rational, logical side of the argument about the many other uses of pony bottles and the additional safety they provide, and say "You know what my rule was stupid I'm sorry I ever thought of it!". You'd be more likely to convince the president of the flat earth society that the earth is a globe. An even better use of your time might be to ask yourself why you care what a stubborn old boat captain thinks of his silly rules since there are certainly other dive boats out there that won't blink an eye at your second time and maybe even give you a pat on the back for giving yourself that extra measure of safety.
Probably also refuses to let divers go below 60 without an AOW card because of the liability. I wonder what his insurance company would say if they found out he refuses to refill pony bottles. It would only take one accident where a tank had been refused a refill to shut him down.