Re: 20" Kick Drum head port hole
"JAW" is an acronym for "Just Above Wrinkle".
The head it tensioned until it is just smooth with no wrinkles in the skin.
Then just a slight bit of tension is added to taste.
Not a dumb question at all.
There are no dumb questions.
If you don't know, Just ask!
alparrott is a tight tuner on his batter, as you can now see from his claim that he goes about two turns above JAW.
For further example, I only torque about 3/4 to 1 turn above JAW. I tune kind of medium/tight on my bass batter.
I kind of like old drums:)