Interesting find jim, I had not seen that system on a C Dory. There is also available a "non feed back system for the cable steering--making an assumption that this is a C Dory which has a push pull cable steering, without NFB, or hydraulic steering. It is possible that there is not room for the NFB system in that boat--but I have put them on small console boats.
Of course one wants to be sure that the vertical trim tab on the cavitation plate of the outboard is set properly. Jim's technical explaination is right on.
Here is from Teleflex: "Friction adjustment is not a standard item in our steering kits and is not available for Rotary Systems. If you have installed a non-tilt "Back Mount Rack Helm," order Friction Kit part number 3953114P.
NOTE: If you have any NFB system (Rack or Rotary), a friction adjustment device is not required nor recommended."
I found the instructions for this:" It's a 2 inch long plastic kinda wing nut that screws into the bottom of the steering column. Clockwise to tighten, counterclockwise to loosen. "
How is the steering resistance? I would ask the administrators for a photo album, so you can post a photo of the steering.