I talk to Hanno in 1977 In Vagas when he won again and again the T/C . the reason he did not put a spinner on is because he moved the engine around so much is to find the right set so the plane would fly straight and track ,when i seen the plane he was flying that week the engine must have been to the right and down some, to put a spinner on that it would have stuck out a 1/4 of a inch out past the nose.