Cup Holder for 1 inch diameter rail
thingiverse
Lock designed to keep patio umbrellas firmly in place when tilted to block the sun's harsh rays. Specifically crafted for 37mm umbrella poles, with a potential fit range of 36-38mm diameters, though thorough testing is needed to confirm. If you find this solution useful, consider donating to my PayPal account at paypal.me to help offset design time. Your contribution will be greatly appreciated!
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