According to factory specs, beginning in New Hartford were F50/ F55's made with 2 graphite neck reinforcement rods, or was that done just on 12 strings? Also what 12 string models- F412/ F512, F30-12, and F212 XL?
Of course it is difficult to know for certain unless the neck is opened up.
Thank you,
Craig
Actually Craig it started in late Tacoma on F512's, Chazmo's has one.
Fender just never updated the spec sheet for Tacomas for that "running spec change" as he pointed out in a thread a few years back.
It was only done on 12-ers, as the first change to their traditional dual-truss rod system since they started making 12's.
The graphite rods were attached to the truss rod to act as stabilizers against twist, the truss rod itself is still adjustable for relief in the neck.
Not sure where you're getting that "F30-12" model, btw: did you mean
JF30-12, which they dropped after Corona?
In New Hartford an upgraded dual-
action truss rod was introduced for all 6-string models, I think the use of the word "Dual" in both systems may have thrown you off as it did me, several years ago.
"Dual
Action" means it adjusts with positive thread engagement in both directions as opposed to simply loosening or tightening from the adjustment nut end.
That was actually introduced introduced in Tacoma as well, but I recall somebody mentioning New Hartford's was different than Tacoma's, seem to recall it was our member who got his Tacoma F50 replaced under warranty at an LMG event because they couldn't repair the Tacoma neck there, because things had changed so much design-wise.