[QUOTE=Anthony Z]Mattia great picture. Your method has appeal to me as I suspect your goal is to stiffen and prevent neck twisting? Out of curiousity if I may, how well does your truss rods work using 1/8" x 3/8" installed on end? [/QUOTE]
That's kind of the idea, yeah. The strings run in that plane, roughly, so distributing them like that just made sense to me. I've done them parallel as well, and that worked. Ultimately, I think if a piece of wood's going to twist, no amount of CF will stop it completely.
I do have to make sure they're close enough in that there's no risk of carving into them (neck cross section helps), but the 1/2" from the edge thing has worked so far.
As for adjustability, so far, no problems, but I've only used this particular setup on one laminated neck (and a baritone neck at that), and I've only built about 7-8 guitars with CF rods in the necks. Works fine on the mahogany (honduras and african) necks I've used, and I intuitively felt I needed them for the bolt-on flatsawn fender-type necks (which often feel a bit 'rubbery' to me). The necks are stiff, but so far, they've not been too stiff to adjust on either electrics or my acoustic, and it's not like I use crazy heavy strings on the electrics (10-52 sets, mediums on the acoustic, which pulled relief into theneck anyway, even a touch too much). I'm a little worried things might get a touch too stiff on laminated necks, or on the rosewood necks I'm going to be trying (on electrics) in the nearish future, and I've been considering either installing the rods less deep, or using CF tubes (intothewind has them, they're cheaper than bar stock, lighter, but also less stiff). I'll report back when the neck guitar neck goes together (walnut/maple/wenge laminated acoustic neck) if I do find it 'too stiff'. I do tend to move the neck manually (ie, bend it), then adjust the rod, so as to prevent undue strain on the adjustment nuts.
For now, HotRod+2 CF bars is a recipe for a successful, even, nicely stiff neck.
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