The standard steerer tube on a bike is 1 1/8" inch (28.6mm). And I have a handlebar and stem that is sized as such. I tried a 1 1/8" broom handle and mounting bracket for the broom that was made of plastic, but it's just too flexy. It needs to mount to the wood pretty securely. It can have some minimal flex, but really I need to lock it together as one piece, and the cheap broom handle just won't cut it.
I think perhaps just a flange of some kind, like how you hang a closet rail? I'm not sure what pipe I can use that not too expensive? In the US they do galvanized pipe that you can screw into various pieces for gas plumbing. It would be heavy though and I'm not sure of the sizes.
It looks the board in the video uses tube that is larger than 1 1/8". Somehow they step it down to the handlebar stem. It doesn't' matter really what size pipe as long as it's sturdy, and even if where I mount is is 1" I can shim it to work.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!