‘Overlocking’, not interlocking
Grip the club with this reduced interlock and you will be able to hold the club in the fingers and not the palms – allowing much more wrist mobility and a full, powerful wrist cock.
The key to a better interlock is not to link the hands with the full length of your fingers. Position them so the trail-hand little finger and glovedhand index finger are only partially entwined.
In interlocking the fingers, many club players push the full length of the index finger right through to between the base of the fingers of the other hand before taking their grip.
Doing this slides both hands too far under the grip, placing the handle into the palms. At best, one knuckle is visible on the back of the gloved hand.
Gripping the club in the palms locks up the wrists. If you can’t cock the wrists to form an L-shape between lead arm and shaft, you can’t create power from lag and the swing’s sequencing suffers.
The interlocking grip places the index finger of the gloved hand between the ring and little fingers of the lower hand. It’s a good way of uniting the hands, used by Jack and Tiger, but if you choose this grip you have to be careful. That interlocking is often overdone… with power and club control taking a hit.