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Title: screws for retaining bar were the wrong type!
Review: Just ordered to address back issues on the basis of other recommendations. When I tried to assemble it, I discovered I could not screw the nuts onto the wire which helps keep the ball on the base. They were the wrong size/type, possibly metric instead of the needed 1/4"-20 flange nut. Don't force if you have similar problems. We got the right size at the hardware store, which was the quickest way to solve the problem.
