I find the 22mm attys a little to chunky on any of my LP's. Beyond the door issue others have mentioned, you may notice on the 2.1 with a 22mm atty attached and a beauty button on your
mod,the atty making contact with the button top/side. If you love the atty you may have to ditch the beauty button if your using one. The RM 4 aka Atomic looks good to my eye others think it is a little chunky. IMO any atty with a sub 22mm diameter should work fine on the 2.1 be it chunky to your eye or not.