On all my scale planes I do a separate pull pull to the tail wheel, it works so much better then the spring and ruder style. Here is a pic of my 100cc Sbach, same as my cub and all my large scale planes. You can use the same servo as the ruder, or install a second servo for just the stirring. This is what I did on my Sbach, I can trim the tail wheel independently from the ruder, comes in handy when you are trimming the plane for flight and don't have to mess with the tail wheel.

TB