I used to grease the tap, tap a few turns, pull it out, clean and re-grease, repeat.
Almost dropped a tap inside from going to far once.
No more grease for me. I air up the intake thru the purge hose with blow gun with a rubber band on the trigger just enough to let the air flow, then turn the motor until air is blowing out the plug hole. Tap it dry 13 turns. All the chips blow out as i tap.
Then i thread the insert on the plug and make it tight. Then a couple drops of red loktite and run it in 13 turns. Done.
I’ve seen a few that the insert came out with a plug change. Dry tapping lets the loktite do its thing.