I was wondering about the bolt too and in the end decided to remove the spoiler. Right close to where the camera comes through there is a sort of oval hole (15mm approx) in the metal which is covered by a 50mm rubber patch on the other side. You could break the patch for better access but still don't think you could usefully tighten the nut to any degree.
Also in that area you may find the wiring looms are different to the video. Mine has an equal number of wires in each of the body to boot lid corrugated hoses.
I think there is a 99% chance of me damaging the other cables trying to get the phono connector through them, which would be really bad as I think some of them are aerial leads
.
After looking at other options I decided I had to cut the phono off. I'll find out if the video is degraded when I solder them back together on another day. On the plus side I used the left hose and didn't have to route under the seats.
If I had a sleeve expander of a large enough diameter and length, that may have done the job. Looking on line it would cost about £55. The searches also brought up animal castration rubbers pliers for about £15 which had good diameter and 4 prongs, but small length. Also they didn't look quite man enough
.
Regarding the troublesome white connectors on the spoiler removal: There is a latch on the right of the side facing you and another on the left of the side facing away. You can just use a screwdriver to release the front ones and tilt the spoiler a little to get the latch in to the hole.
For the rear latch on the RHS of the car it is angled a bit towards you and a screwdriver can be used with a bit of patience. For the left clip, rear latch you would need something like a screwdriver with a 5 to 10 mm bit at right angles on the end, perhaps cut out from a bit of metal or perspex? I took the easy way out and bought the suggested tool
. (Still a bit fiddly but was always going to work).