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Originally Posted by ThinkingPlus
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Are you pondering whether a more flexible shaft will show forward bend easier or pre-stressing easier? I would say yes. A softer spring can be flexed easier either way. Of course our tour boys are very likely cranking X-flexes so the bend will be minimal no matter direction, especially since neither Janzen or Johnson are known for maximum length off the tee.
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I don't think that swing speed is the deciding factor to sustain the pre-stressed clubshaft bend at Start Down. Sustain the Lag and you sustain the bend. Look at Lee Trevino in "Pros at Impact". That amount of Bend is not caused by speed.
I do think that regular or more flexible shafts can show more flex at impact but thats because they aren't stiff enough to rebound after the initial Start Down Shaft Bend.
Arms alone are nowhere close to the force developed by Axis Tilt and #4 Acc against the #3 PP to initiate the Clubshaft Bend and/or sustain it.