Just received a response to my email to B+W. According to them, there are retaining rings in the bay filters. I am beginning to wonder if B&H is selling counterfeit filters.
BTW - the email said that B+W is discontinuing the bay filters sizes.
You'd be doing me, and everyone in this thread, a favor if you'd take a moment to send a copy of your question and their reply to me. My email is in my sig. Thanks in advance.