BOX 9v rechargeable battery

thingiverse

Check out this link: https://www.youtube.com/watch?v=wKdczjdmtyw This lock stops patio umbrellas from spinning around when tilted to block sunlight. It's designed for 37mm umbrella poles, but might work on sizes ranging from 36-38mm. However, its effectiveness hasn't been tested yet. If you found this helpful, consider donating to my PayPal account at paypal.me. Your contribution will help me cover the time spent designing this solution. Thanks and enjoy!