You can make a cheap one with an old frying pan. Take the handle off and screw an arca swiss type clamp to the bottom of the pan (inside/center) to mount the lens or camera to. If you need a little more weight (and to deaden the sound when sliding), pack small sand bags inside the pan around the mount.
I think I read something a few years ago from Art Morris that describe something he used that was similar.
Pat





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