[EdZ]

I will offer my suggestion on grip, noting there are many other options each of which is its own discussion and resulting general pattern.

The simple answer is to understand impact, and how your hands best support the force involved. This must relate to how your body moves most naturally.

In basic terms, I would describe the relationship between left hand and right hand as / and | left and right respectively. The left hand is actually about 45 degrees into the right palm with the left thumb fitting in the 'thumb pocket' formed by pressing the right trigger into the right thumb, ala Hogan's 5 Lessons.

Thus PP#1 is "downplane" on the base of the left hand with the center of the right forearm "stump" as Lynn described previously.

PP3 (to the first joint in the forefinger) is flat, "onplane"

'if' you line up the left arm and club at address, the left wrist is flat and the right forearm is thrusting "downplane" - dragging the knuckles of the left hand Down - wide thin divots

It is called PP#1 for an important reason - that is "the" point of the triangle

Use extensor action and twist away and let the heavy club SWING

While you stay in balance and thrust downward, about 4 feet in front of the ball - both arms straight.

Rotate the hands around the "point", the rotation point

or

bend/arch across the "point", the mirror point - uppercut with the head of the hammer DOWNward with a bent right wrist

All while Supporting the On Plane Swinging Force in Balance

Balance, always - let the heavy club balance you - As Moe I'm certan would agree.

Feel it in your grip, the pressure points.

or