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Dan Schaefer makes a very good point as regards the calibration of
torque wrenches.  As  S.O.P. we have our torque wrenches calibrated
annually.  .  A good calibration certificate will have the equivilent of
a compass deviation card from which you can interpolate the values.  For
those that may be unaware,  the addition of extension's, reducers, and
universal joints on the torque wrench renders the readings speculative
at best. Additionally, you should consider any torque wrench that has
been abused to be nothing more than a fancy paperweight pending
recalibration prior to return to service...We guard our torque wrenches
even more seriously than our other tools, as they are so important .
Keep them in their cases(you did buy the ones in the blow molded cases,
didn't you?) and return them immediately after use.  One accidental kick
across the workshop can render these precision tools useless.  Finally,
using AN hardware is the only way to go as we can attest to the huge
varience of quality in fasteners, even among random selections of the
same box lot of non-AN hardware.  Build and fly safely.  Regards to all.
Jeffrey B. Chipetine