I installed the "40" sized tailwheel onto a 4*40. The instructions regarding the interface with the tailwheel and the rudder are pretty unclear. I also did not want to permanently attach to the rudder so I bent the wire so that it would run underneath the rudder. I then attached e piece of fuel tubing to the rudder with a servo screw and then slid the tailwheel wire into the tubing.

This allows the tailwheel assembly to be replaced without cutting off the rudder but allows the tailwheel to be steerable.

Hope this helps