FATS can be anytime and anywhere during the swing.....alpha, beta, and maybe in some way gamma......in order to twist the shaft along its long axis, you grip the club with some pressure and send "force across the shaft".....
minutia, yes....but ain't it fun
alpha FATS - attempting to look like hogan after a divot
beta FATS - left hand FATS toward the body and right hand FATS away from the body to create tumble
gamma FATS - the fingers wrap around the grip and FATS is everywhere - 360* of it
then we dive into the realm of active FATS and passive FATS (reactionary FATS)
and an active "force normal to the path of the clubhead" - parametric
and a reactionary "force normal to the path of the clubhead" - holding on to the grip as the club accelerates and it attempts to fly out of your hands...
i know o'grady supposedly had things figured out 25 years ago, but this hand path and hand force stuff is tremendoulsy big....thanks, dr. nesbit and dr. miura for explaining things that morad and the golfing machine never got around to