It is difficult to discuss right forearm without discussing left forearm and its "turn to plane" - i found this helpful quote on LBgolf forum archives which is helping me alot with difference between standard and single wrist action ( it comes from Lynn Blake himself)
06-02-04 reads "Standard Wrist Action (10-18-A) is most compatible with Swinging and its Sequenced Release (4-D-0). As it goes back, so it tends to come down, and the Left Wrist Start Up Swivel (Turn and Cock) is the ideal prelude to its Downstroke Release Swivel (Uncock and Roll).
Similarly, Single Wrist Action (10-18-C-2) is most compatible with Hitting and its Simultaneous Release (4-D-0). Here, the Turning of the Body and and the orbiting of the Left Arm causes the Left Wrist to gradually Turn (from Start Up to the Top) and then gradually Roll (from Start Down to Impact). The Bending and Straightening of the Right Elbow causes the Wrist to gradually Cock and Uncock during this Motion.
That said, with the exception of the True Swinger's Double Action (10-18-B), the Left Wrist Action Variations (10-18 ) are equally available to both Hitters and Swingers (albeit with vary degrees of compatibility). And both will find Zero Wrist Action effective for certain Short Shot procedures.
One final important point: At the Top, Swingers using Standard Wrist Action and Hitters using Single Wrist Action reach the identical On Plane Left Wrist Alignment. They just have different ways of getting there. Said another way, for a given Impact Geometry, both Hitters and Swingers have Identical Flying Wedge Assemblies (6-B-3-0-1). Each will maintain the 90-degree relationship of the Left Arm Wedge and Right Forearm Wedge within their respective Assemblies during the Backstroke. This is true even though the different Left Wrist Actions produce different Alignments with respect to the Inclined Plane. At the Top, however, the Flying Wedge Assemblies of both Hitter and Swinger will be identically aligned to the Plane.
From Duffer to Tour Player, I see many failures to establish and maintain the ideal Flying Wedge Alignments. So, look, look LOOK to make sure you've got it right. Because if you don't, a Compensated Stroke is inevitable."
and 07-13-2004 reads "We are in complete agreement. The key word is Rotation. With Standard
Wrist Action, the player actively Turns -- Rotates -- the Left Wrist On Plane
during Start Up. With Single Wrist Action, the Left Wrist gradually Turns
(with the Turning Body and Orbiting Arm) throughout the Backstroke and
reaches the Top in its Fully Turned (On Plane) condition. At no time is there
an independent Wrist Rotation by the player."
Hope this helps rather than threadjacks!