Hammer-and-nail feel for a square, stable strike
The coach offers a visualization for impact stability: imagine a nail sticking out of the inside part of the ball at about 45 degrees, and the clubface as a hammer. Lever the hammer up and back at the trail shoulder, lag it coming into the ball, and feel like you drive the hammer into that nail on the inside of the ball.
Channel: stayhandsy
Watch official source at 8:38Why this context matters
Framed as the 'stability' benefit that pairs with grip mobility.