I recently pulled the rudder off my Legend 37.5 to do some fiberglass repairs. Mine does indeed have a couple of plastic disc spacers on top of the rudder shaft that controls the gap between the rudder and the hull. My rudder had almost neutral buoyancy and as such, I’d have a hard time believing that they would wear significantly being that they are lightly loaded and always lubricated with water. I actually had to sand one of my spacers down a bit as I added a few plys of glass to the top of the rudder and if I hadn’t reduced the lower spacer, the bolt at the top through the quadrant would not have aligned with the hole in the shaft. I did my rudder R&R (remove and reinstall) in the water. Simply make sure you have enough depth for the shaft to clear the boat and that you’ve retained the rudder in some manner. I had a strap around the rudder stock and a rope attached to a block of wood secured inside the top of the post so when the rudder dropped, I had essentially a messenger line going through the rudder tube for reinstallation. To get it back in without anyone going in the water, I built a small frame out of 2X4s that captured the rudder and allowed me to maneuver the rudder upright and into the tube from a dinghy. It was pretty fiddley work but we finally got it aligned and pulled back up into the boat. I was shocked had how HEAVY the rudder was out of the water!!! The quadrant and cable installation is pretty straightforward. I took a lot of pictures to help get it back together.
I don’t know if this helps but I suspect our boats are pretty similar in design.