not to hijack the thread, but ...
for my helmet I use a flat base dash ball socket mount
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
wrap it around the top of the helmet w zip ties
since that's no longer available, this looks promising
https://www.amazon.com/iSaddle-Threa...m+mount+holder
add and "extra" thumb screw to the bottom of the sportcam (because it attaches better to the camera than the generic screw that came with the flat plate mount)
https://www.amazon.com/SmallRig-Came...00CBSL30K?th=1
not all generic threaded mounting screws are equal that's why I use a good quality long photo thumb screw when using these generic type mounts
screw both together & adjust tension & aiming
for mounting on the bars, I use the device that came w my camera, it's been very durable & I can use the OEM quick release slide mount. this is fun cuz I can slide it off while I'm riding do some hand held stuff then slide it back on
add the screw on QR plate to the camera. this screws on very nicely & holds tightly
join the camera to the mount by sliding it on
there are positives & negatives to all mounts. I almost prefer to hand hold the camera but that's not always practical
for use in the car I use the flat dash mount w a beanbag style dash mount (from Best Buy) left over from my TomTom GPS. I just add some velcro