[kragen]

i don't see why it matters whether the center of moment is within the handle or not; the problem is that the glue has to be able to resist the moment without breaking, but it's much closer to the center of moment than the blade edge

say the blade is 100 mm long and 30 mm thick with a cylindrical back edge; the moment is being applied to the blade edge 85 mm from the center of moment, while the glue is resisting the moment from only 15 mm away, giving a 6.7:1 mechanical advantage, and the force is the full force being applied to the workpiece multiplied by sin θ, where θ is the angle the central axis of the blade makes with the force applied by the workpiece on the blade; typically this will be on the order of 0.1, but in a bad strike perhaps closer to 0.3

i don't know, give it a try?