Deliver the blow with the Right Hand
With all stokes in golf your grip is the only point that your body comes into contact with the club. Your grip controls the whole golf swing. No matter what grip you use your leading hand guides the stoke, the trailing hand delivers the blow.
So how does this work? It may seem more complicated with a full swing but it is not. Lets look at the putting stoke.
As you take the club back the hands gently pull the club away from the ball. The hands are working in tandem. Once the swing shifts to the downswing the hands have very specific jobs. The leading hand guides the club right back to where it began. Delivering the club back to where it started will ensure that the club is square at impact.
The trailing hand is the hand that gives the stoke the power. On a full swing if you are concentrating on the feel you can really tell that the trailing hand does the work. On a putt you have to keep it in control. There is no popping motion, no quick actions, simply use the right hand to deliver the power.
Using both hands as one will give you a consistent putting stroke leading to more putts made.