Number 12 is just hollow plastic on my S4RS bike, to put a rod through to push the 11 bolt out the other side.
To get my broken height adjusting rod out, took seat off, undid tank and had it hanging from a rafter with a strap or two. Lifted back of bike off the ground with an engine hoist to let swingarm droop.
From the side, and from above, managed to undo 5 and 7, took shock out too, which allowed me to pivot the rocker enough to get the height rod out.
Lining the shock and rod eyes up to get 11 back in took me a while, but eventually, success.
I think I remembered that right.
Replaced it with a Multistrada one, as there were no S4RS ones available in my country. Same, but with an external hex mid shaft.