Going by the following excerpts from Rule 13-2:
A player must not improve or allow to be improved:
- the position or lie of his ball,
- the area of his intended Stance or swing,
by any of the following actions:
- pressing a club on the ground,
- moving, bending or breaking anything growing or fixed (including immovable Obstructions and objects defining Out Of Bounds),
- creating or eliminating irregularities of surface,
- removing or pressing down sand, loose soil, replaced divots or other cut turf placed in position, or
- removing dew, frost or water.
However, the player incurs no penalty if the action occurs:
... I have to question the acts by the player who started THIS THREAD in the equipment section:
It seems to me that such an act is a direct violation of the points:
"pressing the club into the ground, or"
"creating or eliminating irregularities of surface"
because he is doing more than just:
"grounding the club lightly when Addressing the Ball"
or "in making a Stroke or the backward movement of the club for a Stroke"
He says that he is "pressing the club into the ground" enough to flex the shaft. That's a lot more than just grounding, and would in most cases result in improving the area of his swing, to wit, the area where the club impacts the ball.
I'm open for discussion on it, but at the moment I'm thinking that he's in violation every time he makes a swing.