Capn, just to be one hundred percent clear, when you say "MRI scanned" are you referring to Magnetic Resonance Imagining? The MRI I saw done at a prop shop sure was NOT like an MRI you would get at a hospital. The prop shop's MRI doesn't stand for the same as a hospital's MRI.
Dale, I have seen props repaired this way, and will do mine if they are not very bad. I wouldn't worry for a minute about the balance, cause you'll feel it right away if you did it wrong. If you can't feel it, you will not hurt your drive.
I'm just happy to be here!