An auto parts store should have 'valve lapping compound' that will give the tool bit extra bite. The last one I bought was a double sided tin, (about 30 years ago), with fine grit on one side, and course on the other. Back then it was Clover brand. It's good stuff to have around for any screw heads that are iffy, and those little tins will last you the rest of your life.
This is probably similar to what bob393 is describing, above.
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