Thanks very much for pointing that out, great picture. You are correct, I did not reverse the shaft … that is pretty funny I realized that I did not use the collar … after I mounted the motor I did not want to tear the motor back out – since the screws are hard to reach. I actually did not realize the shaft was reversible.

I trimmed a tiny bit of the foam to clear the shaft. I then used four pieces of balsa tri-stock to stiffen the entire nose section (top and bottom). So basically I formed a tiny little pocket in the front of fuse to clear the shaft.

So I guess the prop adapter has a hollow bore to receive the shaft. I also guess the shaft provides some strength to the prop adapter since the shaft is hardened.

My setup is working just fine. I fly the thing a few times a week – it’s a great setup. But, I’ll make a point of reversing the shaft on the next one.

Strange that the metric prop inserts did not work for you; mine snapped right in and fit perfectly.

Thanks,
Moses