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Just turn the center tube to lengthen or shorten the tube before using the lock nuts to secure the arm position in place. All hardware is treated to help prevent corrosion during the harshest weather conditions and are protected with a 1-year warranty against manufacturer defects.
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.