Fatigue, stress concentration—ai, saiba, for you it is theory, for me it is that old trawler crankshaft that snapped last monsoon because the fillet was like a sharp cliff. You use the data book? Good, but first your hands must learn the *feel* of a shaft running true in its bearing, or the *sound* of good gear mesh. My design book is the salt-cracked ledger where I note what actually broke, and why.
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