One piece guitar necks have a fault line due to grain direction at the angled headstock
Diagram showing the measurement of the prosthesis scapular neck angle. 1
Making an angled headstock by glueing a piece on makes for a stronger neck.
For example, how to get the most strength... The red arrow shows where I'm leaving some thickness in the peghead (it won't be vaneered), ...
Wonder Woman Female Line art Drawing - free clipart