Headless Neck Build

[DaveStaRR]

Hi I have recently embarked on a new bass project and just have a question about the neck i'm trying to build
i am trying to figure out the best way to route the truss rod channel for a headless neck i'm trying to build.

Question(s):
if i want to route the truss rod channel so the adjustment nut can be adjusted from the heel of the neck should it have a curve? and if so which way should the route bow/curve? up or down ? how do i go about the depth of the cut? if anyone of you talented experienced luthiers out there can give me any guidance on this it will be greatly appreciated.. thanks

 

[Tedward]

These make neck building a lot easier.
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I use them all the time.

I'm not a Stew Mac rep.

Tedward

 

[ctmullins]

Yes. The double-action rods just need a straight channel, and provide more adjustability too! IMHO, the only reason not to use one is if you're doing restorations for the Smithsonian.