Gopro curved mount on the helmet to a gopro handlebar mount with a handle of some sort in the clamp(I am using a lightweight aluminum handle off a construction site magnetic clean-up tool). The handle I chose so that in the end of it I could put a gorpo joint piece into with washers spacing the digits of the joint properly and facilitating a strong camera to jig mount. The last step is ziptying the tail of the jig to the rear crown of yoru helmet and then to the front/visor for stability. Yea it sounds real ghetto but it's solid, when I have time I'll throw a picture of the contraption up!

 thanks dude