Ernst thrust plates from Quantum Models, or maybe its just Quantum. They come in a pack of three, 1,2 and 3 degree. You can add them up and turn one sideways and get some up or down thrust in with the right. When I ran the Saito 100 it required 3 degree. With the YS 110 it needs 4 degree. From what I hear, Sullivan tailwheels are a good product. I've never had the pleasure of trying them. Good luck, Joe