I must admit to a certain degree of paranoia when tightening bolts. I once had a brake calliper mounting bolt come out mid-journey & the front rim had to be skimmed & the wheel rebuilt (spoked). I had only used a long allen key & clearly hadn't tightened the bolt sufficiently. Having looked at a few articles online, it would appear that if a torque wrench is used infrequently (guilty as charged) they can give seriously inaccurate readings.
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