Check and see if you have an Allen head screw to loosen the assembly..put a little bit of tape on both half's so you can put it back in the same place when you are ready to put it back
Double check, the Allen head screw's are under small plastic caps that are straight blade, turn cap 90° and they pop off and the Allen head screws are underneath. Should be in two locations on each mirror, one to rotate the mirror mointing arm arm and other to rotate the upper mirror assembly
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2005 Winnebago Journey 36G, Cat C7
Apple Valley, MN