Pillbox

thingiverse

Here's a lock designed to stop patio umbrellas from spinning wildly when tilted to block the sun's harsh rays. Made specifically for 37mm umbrella poles, this clever device might also work on sizes ranging from 36-38 millimeters - but that hasn't been thoroughly tested yet. If you've found this handy solution useful, consider sending a donation through PayPal to help offset the time and effort put into designing it. Your contribution will be greatly appreciated!