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VigilanteTrail jmo, but those shafts are weak. I've 'waggled' the drivers in stores and the S flex seems whippy for even my miniscule biceps.
I sold a set of Ping irons last summer to a fella that proceeded to break 3 shafts, at the hosel....those TFC. I did get to play in a tourney with him last Fall and could see that it was not from hitting the ground. Hard, fast swing....wrong flex/wrong shaft.
Your bro may just be a beast and you won't admit it.