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The rise-and-fall columns are not square to the monorail and not parallel to each other. Four spring-loaded ball bearings designed to engage detents in the columns are missing. This would include any batteries sold on their own.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.