Ender 3 Extending Camera Arm

See update below.

I've been using a camera mount on the bed handle (Thing 3077545) for a few weeks now and, whilst I love the design, I noticed that the handle started to sag - presumably under the weight of the camera.

A second niggle was that the camera was very close to the bed, which is fine for small items, but anything large would go out of frame during the printing.

I had previously looked at the mount devised by one_2_three, because I liked the way it bolted to the frame and did