Nice shovel mod. I'm glad you posted the fail, and what caused it, too. I don't have a long shovel, but am hoping to some day have a good one. I do like the saw teeth on both sides of my White's digmaster hand digger. They do cut through roots that a straight edge won't. Not sure about the best teeth design, though. Maybe smaller, or alternating edged teeth would be better? I think your teeth design looks like it works well, but if they weren't so high up the blade, where the heavier prying action happens, you could better avoid that breakage. I'm thinking 3 to 5 less teeth at the top on each side, and you'd still be digging(and sawing) with that beast. Notice where it broke. Right through the top teeth cuts, which were inline with where the center weld ends. Makes sense that it broke there, where the force is concentrated during prying.
