I'm 5'9 so it probably wouldn't work for me either.
Doubtful, the plastic would melt if it got hot enough to alter hardness.If it was stuck in a fire you could have lost some of its Temper, the hardness May be deminished.
I’ve cut a few cords with mine and the only dull places are from hitting the ground.
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There has been lots of comments about the edge over the years. Some people think it's not hardened because when you hit something hard it will chip. Some dont think it holds an edge well because they use softer steel.It wasn’t holding the edge before that, but no doubt that was a dumb move.