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We use a foot and the floor.
A jig/vice type set up was always on the "to do" list, just never happened. I also wanted to make a flex continuity tester that was a faster way of testing flexes in bulk than a multimeter (single socket on a surface backbox, 9v battery powered LED light drilled in, wired in such a way that you plug the flex in and the LED lights if there is continuity when the terminals on the other end are bridged).