Simply mount the thick knobs to this RAP-274-1U frame mount using zip ties with angle adapters so that it sits flush with the rudder jib. See photo. The only downside is that when I press the buttons, the controller pushes down a bit and it's still usable. This is because due to the nature of the mount, the mount will flex somewhat, requiring you to squeeze and twist to attach. It can be easily removed if you need to unscrew it. I have to cut the zip ties to change the battery, but that won't happen often.
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