The Flat Left Wrist is one of the Imperatives, but how FLAT is flat? Back in the Square to Square days... the FLW was IN, but I believe many people probably actually got it ARCHED. The same is probably true today with TGM.
One can play with ARCHED, but Flat is probably better for most. Depending on one's grip... FLAT may visually LOOK a little BENT("equivalent"). Also, the way one's hand and wrist bone is per individual varies, so the look can vary.
Of course, if one CHOOSES to employ DOUBLE WRIST ACTION, the wrist will be BENT... at the TOP. With most good players, it Flattens during the IMPACT INTERVAL.
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