I had to spend about an hour disassembling the vise, cleaning all the threads and sanding the internal rods. The oil it was poured into after threading was dirty oil, or not enough effort had been put into cleaning up all the metal shavings. So the screws don't turn easily. The top two pieces couldn't slide up and down easily because the posts weren't smooth. One of the poles was also slightly out of alignment. After cleaning it works perfectly.
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