Oh, probably stating the obvious here but I had the motor mount and motor installed and the actual central hobbies nosering mount screwed to the nose ring frame while I shaped it. I also had everything installed when I glued it in so I could get perfect centering.

My nosering sits about 1/4" back from the inside of the nose, there are 1/4 balsa spacers at 2 points at the top and bottom that align the nosering properly against the front of the fuse and set the distance back. I used a mixture of 20 minute epoxy and microballoons to secure it in there. Its not coming out, ever. And it came out light. [8D]

Once it was all done I could not get the Central Hobbies nose ring in and out since its width is a little greater than the hole on the fuse and 1/4 wasnt enough to tilt it to slide it out,,,, so I just dremeled out on each side just enough to give it a clean exit.