I owned C-38 #297 (1985) model. On that boat, the rudder post fitting is located on the seat directly behind the wheel. There is no cap like on a C-34, C-36 or C-42. On my C-38 the rudder post fitting had a socket for the emergency tiller which actually worked quite well, unlike the joke fitting on my C-42. As some C-38s had tiller steering, the rudder post fitting looks just like you could take out the pedastal steering and fit a tiller. The rudder post fitting makes a great rudder position indicator exclusive to C-38s. The rudder post fitting was secured with single cross bolt. Below the rudder post fitting, is a nylon ring which acts as a bearing. Remove the bolt, & the fitting should come off unless corroded to the rudder post. Caution, the rudder post can drop when the rudder post fitting is removed. It will not drop out of the boat completely but will stop when the quadrant hits the rudder tube. Cut 2 x 2 lumber to prop under the quadrant to prevent the rudder from dropping.