Join Date: Sep 2007
Location: Carlsbad, CA
Bikes: '09 Felt F55, '84 Masi Cran Criterium, (2)'86 Schwinn Pelotons, '86 Look Equippe Hinault, '09 Globe Live 3 (dogtaxi), '94 Greg Lemond, '99 GT Pulse Kinesis
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If you want to tackle this yourself without buying the truing stand and tensiometer, tighten the spoke(s) at the drop until they are the same tightness as their surrounding spokes. To determine this without buying a tensiometer, pluck that spoke and the surrounding spokes; they should have a similar tone.
How's the side-to-side play, by the way?
If you get the replacement spoke's tone pretty close to that of the surrounding spokes and the wheel still has the dip, tighten the spoke at the dip about a quarter turn, THEN loosen the opposing spoke that is on the other side of the wheel by the same amount. Hopefully it won't come to that, because when you start making corrections like this without having the tools, or some experience in wheelbuilding & repair, you might end up spending more time learning than riding.
Good luck and let us know how it goes.