Is this possible at a drop of 4 feet???
Based on your testimony, I say YES.
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At this point I'd recommend learning why it happened and then perform checks on a regular basis. It's really nothing more than tightening a screw.
The screw may become loose, was improperly fitted, or replaced with a incorrect screw. When dropped, the weight of the cylinder assembly may have sheared the screw or damaged the crane, or both.
When shooting, the screw is not needed, it's only there to keep the crane in the frame.





















































