Well well before was exaggeration, it ends within the heel section. On Fender necks with headstock adjustment the rod ends also in the middle of the pocket, about 1" from the end.
However, the end section of the truss is not effective area both due to the neck being glued there and the threads inside the rod, the rod basically only curves well after the heel anyway.
Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.