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I've lost my working notes and I don't have a rod on hand to measure, and I'll be cutting the truss rod channel in a neck...

So does anyone know the depth of the channel for a Martin dual-action truss rod. The width, I remember, is 1/4 inch, but the depth?

Thanks!

call me I can measure the rod for you

Mission accomplished, we had a Martin truss rod in hand when we cut its channel in the neck yesterday. Now I gotta build a body to attach the neck to...