RAM compatible handlebar mount.

Handlebar mount 22.22mm (7/8") diameter for a RAM ball. I've uploaded the 1" ball I've used. All the hardware is from Harbor Freight metric kit. 6mm x 30mm and 6mm x 50mm hex. A lock washer might keep everything tight. See the sturdy 1" ball in my designs for ideas.

Metric hex machine screws - https://www.harborfreight.com/725-piece-nut-and-washer-set-with-6-inch-parts-tray-67624.html

Prints without support on their sides. I use .2 resolution with 30% infill. I up it to 3 walls on almost everything I do, especially stressed parts.

PETG is preferred as it is outdoors.