This is a mount for a camera that can rotate freely and be clamped to place to allow leveling of the frame from any angle.
I used 5mmx5mm M3 knurled nuts and bolts.
To mount the clamp to a lamp arm, I fabricated an adapter from a piece of angled aluminium. You might need another way of mounting depending on the arm you are using.
For more details and photos, please visit https://harariprojects.com/2018/11/15/universal-angle-camera-arm/