There’s a picture of the clamp here:Thank you Brian. The 10" bar clamp device sounds like a great idea. I use a gorilla pod, and a larger bendy-leg tripod, to "securely" attach to poles, handrails, and other objects, but I am still bordering on panic when someone walks by and everything shakes. In my minds eye I see my iPhone plummeting to its death on the rocks below. Ugh. Now I won't sleep tonight
https://mobitog.com/threads/diy-clamp-mount.23342/
For your Gorilla pod you need a Velcro strap to wrap around it and the post for added security.