[O.B.Left]

Right forearm goes back,up, and in. If you are not sure trace the plane line with a flashlight attached to your right forearm.

Yes thats the best and easiest answer, ICT. But if you'll allow a far more long winded and therefore stupid reply:

Point the #3 Presure Point , the Sweetspot Plane ( or the clubshaft if you prefer, though its not quite correct technically ) at the Plane Line as you Fan and Bend your Right Forearm and Elbow. This pointing is referred to as Tracing the Plane Line. That is job #1 going back assuming you want to be on plane. If your Right Forearm is on the Inclined Plane at Impact Fix or Address prior to Tracing , you are off to a great start.

Plane Line Tracing is more critical than Plane Angle considerations of which there are options. With the Right Forearm Flying Wedge intact , On Plane and Tracing the Plane Line it is both a strong, superior in fact, mechanical alignment (think construction cranes, load bearing arms etc) and geometrically (plane line) compliant. Force and Direction. Physics and Geometry. The #3 pp is both Thrust and Direction.

To see the need structuraly for the RFFW, press a club head against a door jam or the edge of a rubber hitting mat or something. From a impact like postion try to bend the shaft as much as you can with your Pivot and/or Right Arm. You'll find Homers alignments appear pretty quickly. Your grip and alignments will move around automatically to reveal Homer's RFFW, left thumb down the aft of the shaft, #1 pp thrusting , #3 sensing the resistance etc etc etc its all there. They arent opinion or preference they are just mechanical, structural reality. My good friend, Dooger actually bends the shaft like this into the ground prior to addressing the ball when playing. He doesnt know anything about HOmer Kelley, doesnt want to, but he can flat out compress the ball with his alignments. I curse the guys existance sometimes. Fortuneatly Doogie was not in attendance when the Golf Gods were handing out putting acumen. One of the Lords tender mercies for all who play him.