Camera mount that fits road bikes
 

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Tried that and it won't fit my Fenix. Anyone have suggestions for a mount that will before I blindly order another cheap mount off amazon?

What exactly are you trying to mount and where exactly are you trying to mount it?

There are a couple sizes in this type. They are adjustable and I have has success with them.
Robot Check

Digital video camera to my handlebars.

Standard Photo Tripod mounting screws, are 1/4"-20, there are round tube clamps to tripod screw pieces out there.

3rd post is one of those, as is that thing you tried,

Fenix only users will be the only ones that know what you need , since you dont say. whats there.

Like fietsbob says, we don't really know what you are trying to mount and what kind of mount it uses. Most cameras have a native 1/4" x 20 screw socket. That is the standardized photographic tripod mount. Some are proprietary like older Contour, some Sony, a small number of GoPro style clones and use adapters to get to 1/4" x 20. If it is a standard tripod mount then there are myriads of options already available, you just need to decide how cheap you want to go and watch the measurement for the mount itself.