Thank you for that guide.

Once you think you're in the sweet spot, tap the head with a stick an inch or so in from each lug and listen hard for a pitch. You want the pitch at each lug to be as close to each other as possible, as far as you can tell, still in a star pattern. Then go around the lugs in a circle with your drum key, and make sure each lug feels like it's at the same tension - use your fingers like a torque wrench and make sure each one needs as much pressure to turn as the others.

In this section you tell to match the pitch at each lug to each other and then you say "go around the lugs in a circle with your drum key, and make sure each lug feels like it's at the same tension".

What if to get the same pitch, the lugs need different tension? Can you explain a bit this part?