[morzh]

Yep, performing operations like this, you need a large magnification microscope and the needle should be fairly small size and so very hard so it does not bend.
But if the record was ever non-bumpy, bump is likely made of dirt and so can be attempted to be dissolved/washed. A cavity, on the other hand, has to be filled and this would require a suitable dispenser few would have.

Sometimes finding a new record is easier