I just bought an F4S and an MB-20 battery pack. While my MB-20 is rounded where my middle fingers' tips grab it, the MB-21 has a squared-off extension there that makes it much more secure to hold. Now my question: Do the later (currently available from B&H) MB-20 battery packs have this same squared-off extension for the middle fingers? Thanks, Neal Panama City, FL [EMAIL PROTECTED]