Tiny knob that screws onto ARCA plate, can't be tightened properly with a large camera (I have a Nikon D7500) what to do may cause the camera to slip and fall. Extremely bad design ruined my very good camera lens. My suggestion to the company: put an Allen wrench on the grip so users can tighten it properly. In fact, all the twist locks on a tripod are difficult to keep in place when you're walking around with the tripod extended.
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