The thor of tanum
thingiverse
Patio Umbrella Lock Prevents Sunblock Spinning Designed for 37mm umbrella poles, but may work on sizes between 36-38mm. Tilt your umbrella to block the sun without worrying about it spinning out of control. If you found this useful, consider showing appreciation by donating to my PayPal account. Your contribution will help offset the time spent designing this solution.
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