I've used the Dubro Pull-Pull systems for years until recently. I now just buy the plastic coated wire braided leader from a fishing store (Bass Pro Shops) with their crimps. I then just buy the threaded couplers & clevises from the LHS. I thread the fishing leader through the crimp the same way as it is illustrated on the back of the Dubro package and haven't had any trouble in years.
In regards to attaching the rudder to the steerable tail wheel, I usually run a Hiage (SP?) style wheel from Dave Brown, SIG, or Ohio. I run springs from the rudder Pull-Pull control horns to the arms on the Haige style tail wheel assembly. I use the Haige style tail wheel assy. because is helps protect the rudder in those Tail Touches, Harriers, etc. and makes the aircraft much more controllable on the ground with cross winds. Once you try a Haige style tail wheel assy. you'll want nothing less.
Most Haige style tail wheel assy.s come with an illustration on how they are set-up. You can also go to my website and look at my aircraft. You may see some pics to give you a better understanding of what I am talking about.
Kevin