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.
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I'm just happy to be here!