folks, i have a bit of struggle with this. my plan was to adjust them since it's a bit off and right-most arm hits the windscreen trim when switched on.

i have taken the cover and the nut off. i lift the arm up and try to pull it away (while bent like an elbow). however the thing won't budge. i have also soaked in WD40 penetrating spray overnite.

it should be just a simple spline joint right?

btw is there a correct technique to take it off (and putting it back on) since i'm afraid if i use brute force, it may hit the windscreen and cracked it.