Rail Grip, Rail Cover - shortened M-Lock
thingiverse
Here's a shortened version of the design: https://www.thingiverse.com/thing:3613533. This lock prevents patio umbrellas from spinning around when tilted to block the sun. Designed for 37mm umbrella poles, it may work with sizes ranging from 36-38mm, but hasn't been tested thoroughly. If you find this useful, consider donating an amount of your choice to my paypal.me account. Your contribution will help cover the time spent on designing this lock.
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