The small knob that screws onto the ARCA plate cannot be properly tightened with a large camera (I have a Nikon D7500) which can lead to this that the camera slips out and fall on the floor. 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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