It sounds like you don't have the front in the right place. Watch the videos more closely there is a spot for the front boss to go that is non-obvious. Otherwise you may just need a shim (washer) to give the screw something to bite on and tighten up. Compare old vs new you may find the difference


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)