I've had them for a long time and they work they hold your bed but the part of the clamp that holds the bed has such a small surface area compared to the whole clamp they are really big, to avoid handles or a heater under the bed, and you still have a lot of free space. I noticed my casts shifted due to the movement of the bed and one day the whole bed came off the bracket. Honestly you are better off using binder clips than these, it's the same concept. In any case, I'll replace it with something. which has a set screw to hold it in place, or clamps if those don't work either.
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