I installed this and then attached my ball head, tried tightening the thumbscrew to fix the pan position and it looked like a part inside was made out of plastic and fails. I have never turned on my camera before this failed. I also found that when I used my fingers on just one ball head to back off the clamp screw while rotating the pan base, the adjuster would loosen after tightening. Total failure of the product due to the choice of design/material used in production. AVOID THIS PRODUCT
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