Heli, yes the spinner is a big PITA. I don't know why the hole in his back plate is so large. It is a lot easier to make a small hole larger than a large hole smaller. Also no hole in the front of the spinner. I was very careful about centering the hole and drilling in on a drill press, but it was difficult to clamp down the spinner securely. But I balanced the prop by removing material off the back of the heavy blade (it was three blade). Also balanced the spinner by drilling shallow holes on the front face of the heavy side of the plate. Must have worked, because vibration is not too bad.

Had a chance to fly the 109 last week as it was not too windy. This is not a cross wind or gusty wind airplane, at least when trying to land or takeoff. Now have a total of eleven flights and haven't torn it up yet.