If you need more information about where "the D-plane" came from, start with (Here) and then books related that to golf such as The physic of Golf; Science and Golf III & IV.
In Homer's book tilte, what is the letter "G" states for?
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If you cannot take the shoulder down the clubshaft plane, you must take along some other path and add compensations - now, instead of one motion to remember, you wind up with at least two!
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