Quote:
Originally Posted by BradHall
Looks like you already have a significant block on the top. If you were to extend it wouldn't it interfere with your top horizontal braces?
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The images are David's: the question is GrimesGrimes'.
The extension isn't mandatory, depending upon the overall scheme of one's construction. Many guitars have successfully been made without it. There does need to be some support, however, to resist the forces of the neck in that area. There are numerous ways to provide that support.
As part of the approach that I use, I adjust the truss rod from the sound hole through a hole in the upper transverse brace. Amongst other things, the extension provides support for the truss rod, which extends to the upper transverse brace just above the sound hole. That eliminates "fishing" for the truss rod nut that's "somewhere" at the end block.