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Patent Pending: Anti-Spin Patio Umbrella Lock Prevent your patio umbrella from spinning out of control when tilted to block the sun with our innovative lock design. Engineered specifically for 37mm umbrella poles, this clever solution may also work for sizes ranging from 36-38, although further testing is required. If you find this design useful, please consider a donation through paypal.me. Your support will help cover the time and resources invested in its development.