Mark, I did what you did except left the stock tailwheel unit and used ball links with the 4-40 rods (on all surfaces) and got a good Dubro control horn for the rudder. Oh, I used the Dubro heavy duty extra large servo arms too. With a 90 ounce rudder servo it will pinwheel. Harriers are a rocky experience and blenders aren't the tightest, but hovering is very confidence-inspiring and this plane does the coolest Parachutes I've ever seen.