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This is not normal. It should open up while opening the knob. Mine works that way. The hex screw has only to be taken off to set the upper rail to the different horizontal starting angles, 7.5° etc. fix to one of these starting positions. The upper rotator uses 15° steps added to the first horizontal angle, so 7.5° with click to 22.5°.
I feel you should return it to the reseller. Which country do you live in ? Good video.
I am quite sure you'll get a comment by Nick soon.