I have an opportunity to buy a Zen DP100 minidome to fit my Aquatica housing. It's a great port in terms of its optics, and the price is very competitive, but I have one concern. The port is a snug fit, but the bayonet will not lock, as it was designed prior to the introduction of Aquatica's port locking mechanism. The manufacturer has sent a message via the vendor that the port should not work itself free... their exact words: "Since there is no leverage on this port the likelihood of of a problem is basically non-existant." So what should I make of this? To an extent I think Zen has a fair point. It's a very snug fit and it doesn't move around easily. But I'd be interested to hear from any other Aquatica owners who have tried this port.