I got a block as a gift at the turn of the year. Nice body and lenses looked good. I noticed that the lenses were sometimes twisted tightly out of the clamp. Then one of them got stuck. Even with pliers it didn't come out. The metal ring (brass) broke out of the clamp when unscrewing it. Went ahead and ordered some universal clamps to see if they would work better if the threads were suitable for lens use. If the new clamps also have metal threaded rings, apply some silicone grease to them. With the aluminum threads that were on the lenses, it seems necessary. Support responded immediately to the request to receive a new clip. Due to a problem, send a completely new device with good extras. Excellent customer care. I'm excited to see how the new clips work.
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