'facing the plane' and the 'entire left arm wedge parallel to the plane' are different.
Take a look at the photo 10-13-D #2. The hands are 'clapped' ONTO the plane, or as I like to say - "hugging the flail"
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"Support the On Plane Swinging Force in Balance"
"we have no friends, we have no enemies, we have only teachers"
Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D,
6-B-3-0-1, 6-C-1, 6-E-2