I have changed my alpha 60 from a 3 blade to a 12x7 APC 2 blade and i cannot find a 2.5 inch spinner to fit the flywheel on the Evolution .61. I tried a Dubro 2.5 spinner and the back of the spinner is not flat. The original spinner that came with the plane has a flat back and this is what i need, just a 2 blade , not a 3 blade. It has to fit flush against the flywheel. Any suggestions ????