When I built the V2 it required a 3/8 motor mount spacer to be used with the O.S. 1.40. On the V3 I am using the OS 1.60 with the AR80 mount which is a universal mount. What size spacer is needed for this setup if any,or will this be a trial an aira type deal. I know someone out there has this setup, so how about your trials an I want have no eara's Plus I came up with a removeable servo mount for the Elevator.