It really worked after some "fixing" by you. It comes with the corner clip detached from the screw handle. I took the piece apart and screwed in the set screw I believe should hold the piece. It worked briefly, but then that part of the clamp fell apart again, this time with what appeared to be a snapped set screw. I had to find a screw of the same size and drive it into space. After doing that, it worked for my latest project.
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