I made my own adaptor for the Platt spinner. Used a stand off and a bolt. The stand off is machined so it fits right into the two part nut that came with the OS 1.60. It turns true and has given me no problems. My tailwheel is from Hobby King for about $6. It's a bit stiff as I mounted it but works fine. I could have used some tail weight, so a retractable tail wheel would not have been too bad, I just didn't want to mess with it.