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I think they can just let the arm lock in to the raised position and replace it, worse case scenario they might remove the arm, which is one bolt. No reason to pull anything beyond the arm, the pivot won't be in the way, they might pull the trim.
Can't help on cost, if you get MB glass it will probably be more than that, depends on how nit-picky you are, I'd cost it out w and w/o MB glass
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