Thank you Brian, for pointing out that you can't put the adjusting bolt down the side of the trailer through the hole next to the top pulley. I've not had to do this job myself so I was "guessing" that would be the easiest way.
I wonder if that hole is large enough to insert an electrical fishing wire tape down the side from the upper pulley, tape the cable to it (using duct tape) and then pull it back up? If the tape is too big, possibly just lowering string through the hole and then using it to pull the cable back up would work? Since the cable is stiff, I can see how, with a bit of finagling, you could get it up and out from the bottom, but it would seem to be difficult that way.
- Jack