At first I was impressed by the sturdy plastic construction. I bought them in February 2020 and only wore them a week ago. When I first folded them (they are spring loaded) the right one just flopped. I immediately removed the bottom cover and found that the compression nut and spring had just popped out. THIS IS A WEAK LINK. A pretty flimsy way of connecting the mirror to the base. My Revain return window has closed as I've waited until spring to install them. I've tried to contact Best Top to no avail, but will try again. I would give five stars until the right one just fell apart within the first week.
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