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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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That's not a torsion failure. . . more like reverse-bending fatigue. That 944 shaft, OTOH...
oh, and keep in mind that the key (in the keyway) likely provided support. ..it's not always so simple to point to corners as stress-risers. YMMV
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
Last edited by island911; 05-17-2010 at 03:07 PM..
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