There are levers that hold monitors in vertical alignment. In my experience, however, it couldn't handle the weight of two 10-pound monitors, which they kept dropping. Its design has 2 sets of conical washers to maintain tension when tilted vertically. However, once you twist it tight enough, the nut holding it in place falls out of the nut hole and it just falls apart. It seems like a really bad design to have something to build tension on and once you go too far it just falls apart.
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