I got one of those things for $20. But it wasn't going to fit my stem, and I had to buy a longer screw for the mount. Even then, the fit is off. I was thinking about buying a watch with a flat surface, like this one here, so I can use one of the flat sticky mounts that came with the go pro package, and use that on pretty much any bar I want. Has anyone tried this?

GoPro makes an handlebar mount

K-edge makes some really nice ones.

https://www.amazon.com/dp/B005YVTJRU

^ These are the only ones you need ^ K-Edge ftmfw.