Yamaha Weddington Classic Owner's Manual - Page 11
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TRUSS ROD ADJUSTMENT
The curvature of the neck should be slightly concave. The
practice of sighting down the neck to see whether there is a
bow or bend is unreliable, and even experienced guitar
technicians
can
be misled by optical illusions. A better
method to check for proper curvature is as follows:
1) To check the extent of warp, press a string down simul-
taneously at the first fret and at the 16th fret The extent
of warp is the space between that string and the top of
the fret lying half way between the two fretted points. (To
free on hand for this method, you might use a capo at
the first fret.)
2) There should be approximately
0.002' to 0.008' (0.05 to
0.20 mm) space between the bottom of
the
string and
the top of the fret. This
can
be checked by slipping an
automotive feeler gauge under the string.
3) If the spaang indicates that the curvature is not correct.
remove the buss rod cover with the screwdriver end of
the tool provided with the guitar. Then adjust the truss
rod nut with the hexagonal wrench. Clockwise rotation of