Hot shoe adapter for 20mm tube/boom

I initially designed this to mount on the bottom tube of my Manfrotto 680B monopod in place of the rubber foot. It can be used with any 20mm tube, pole or stand to create your own boom for mounting flash, videolight microphone, etc., with a hotshoe mount plate.

Design uses a M5 nut and M5x20mm or M5x25mm bolt to clamp hot shoe mount around a tube.