I have been working on this method for the last month or so. So far the effort has been successful, although my round experience has been minimal.
The key factors for me have been:
1) Put the left hand on the putter first, the same way that you normally set your left hand, and then bring the right hand onto the club between your Thumb and Index finger. Don't squeeze, the right hand is just along for the ride.
This from a Right-Hand Putter.
2) Then, just before taking the putter back to make the stroke, I lift the putter slightly off the surface. Then just let it go. Less tension, more solid impact, especially on longer putts.
A work in progress, but the solidness of the strike has been amazing, and the lack of tension has been unique.
Oh, and I forgot ... No rolling or breakdown of the wrists.😃