70 D100

I believe it be okay will as long as you aren't able to snag a fingernail where the rings were sticking at once you get a crosshatch worked back in. I doubt it will be a problem, they really don't look that bad! A two pound dead blow on the wooden drift will work nicely, oil the walls liberally and let it soak overnight. The combustion byproducts in used oil work nicely on rust.