A few pictures of the propeller shaft arrangement.
The first 3 pictures show the outside. The whole shaft arrangement is slightly out of line with respect to the longitudinal axis of the boat. This enables pulling the shaft from the outside. Otherwise the rudder skeg would be in the way.
The bracket holds the Vesconite bush which supports the shaft at the propeller end. There is a similar bush on the inside where the shaft enters the stern tube. Clearly visible is the zinc anode right in front of the propeller. The 4th picture shows the mechanical shaft seal, and the flexible coupling between shaft and transmission gear.