I fully agree HungryBear. It is not possible to draw a straight line with the left arm in a golf down stroke.
These delivery lines must be more feel than real. There is a sharp turn by the end of the straight line that interests me. Because that's the point where the Accumulator #2 is released.
I regard the straight line as the part of the delivery path where the longitudinal work should be maximised, and any work that migh trigger the throw out is avoided or at least kept to a minimum.
Just the purest longitudinal pull of the butt end of the club. PP#1 only for drivers. Minimum shaft loading basically. With a snap release you should feel how the load increases quite suddenly when the throw-out starts. And from there on you can't have to much shaft loading. With some practice you should be able to time it deliberately.
With a "straight line" approach you pretty much keep A#2 till your hand have come a long way down towards the ball, and then you either force it to go (non automatic release) or it is forced automatically. I often use aiming point to guide where and when this happens.
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