Chances are that is just a little depression if it shows up on the fingernail test. Knocking it down with a fine stone should have taken care of any protuding burr, if you can run a fingertip over it without feeling something sharp trying to catch it it should be fine. I'm sure my tilt rams have far worse damage and they don't leak excessively. Plus, they're around 40 years old.
Ive done a few nicks by using fine emery cloth then mix up some epoxy and spread over the nick when cured polish it with fine emery cloth Ive done this on winch shafts and Diff . pinions seems to work ok sure saves a few bucks