Yes 64x casesthe 64x cases?
since that are not thru would it be worth blending them in smoothing it out, how about epoxy materials like Devcon, JB Weld or some crap like Alimaloy to fill it in?They dont weld easy due to corrosion but They will run fine as long as there not all the way thru. Just looks bad.
Its really not necessary they're not going to run any better one way or the other.