Well, easier said than done
I took a few pics but hard to see. I put a coat hanger wire in for a reference for size. I marked the wire with a white stroke in the photo. In one you can see the freeze plug on the end. Overall don’t see much that needs work. It’s pretty much like what you can see down the hole. Probably not worth smoothing it out with the effort it would take. . Some kind of flapper sand paper to run thru the hole on the end? A long porting bit?
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