How do you go about achieving this? The only way I can get the shaft inline with the right forearm is to either have the right hand in a "strong" position or to have no part of the right thumb pad overlapping the left thumb.

I have changed the style of my putting to a claw grip in the past two months. I lost awareness of acc #3 and seem to be more concerned with Acc#2.
Particular to how upcocked, level or downcocked my wrist position is. I feel I can roll better with a slightly upcocked wrist.
When my wrist is downcocked I have a better sense of "run" rather than "roll" of the ball

I would suggest setting the right hand (assuming you are right handed) on the putter so your forearm is in line with the shaft and take a few practice putts just with your right hand with the number one and three pressure points directly behind the shaft. Then add the left hand to the shaft with the shaft running up through the lifeline of the left hand. Both thumbs should rest on the top of the grip. It may help to initially run both forefingers down the length of the shaft.
I wish I could explain this better. Dary, O.B., Kev, City, can you help?

Thanks for the reply, Jerry. I can get the shaft running along the lifeline of both hands when they are gripped in a non-overlapping manner or individually. However, as soon as the right hand overlaps the left hand (i.e. using the reverse overlap grip), the shaft shifts to below the right forearm but remains inline with the left forearm.

Rather than the left forefinger falling over the little finger of the right hand, straighten the left forefinger down the outside of the fingers of the right hand. The left forefinger should point down the shaft. You may also point your right forefinger down the shaft so both fingers are parallel down the fore and aft of the shaft.

With the elbow stroke...
 

I run my # 3 PP on the aft side of the shaft. It is very, very dependable! ILYGIAMF (I love you guys in a manly fashion). :)

How much to zero out?

I try to zero out to the heel pad and I still feel a bit of twist/torque

I try to zero out to the lifeline of my left hand and this gives me the most confidence feeling of straight back straight thru without the twisting of the shaft/clubhead.

This puts the pressure out of the last three fingers(PP#2?) and into the palm of the left hand from the pisiform bone to the 1st metacarpalphageal joint.

I go up the Lifeline and add an Uncocked Left Wrist. That may put things a little past Zero.

the Praying Mantis
 

I have to agree with Daryl. I also place the club in the middle of both palms with both wrists Uncocked.



It's different than the normal Right Forearm alignment. Instead, the shaft points closer to the sternum. As the club approaches a vertical Plane, the clubface approaches Vertical Hinging.

In order to match my unusual Address alignment, my putter is set at 74 degrees instead of 70. It's my opinion that most putters are too flat and too light. It's not unusual for a Tour putter to be in the mid 300 grams, where it's difficult to find many consumer putters in that range. My custom Bettinardi is 395 grams and has the same grooves that you see on Brian's putter.

It's the one club in my bag that I can't live without.