I understand, Possum, but I am not talking about what you or anyone else should do today. We were talking about what the ancient Japanese did before a battle. If you were going to use that razor as a tool for manipulating another razor and an armored man holding it, then yes, its being dulled has made it stronger. You have increased the surface area of the edge which would help dissipate the force of another swords' cut and lessen the chances that a shard of the cutting edge would go flying off of your sword. (which happened all the time) The same thing goes for the meat cleaver. If you're going into battle against an armored, meat-cleaver wielding opponent, then the edge might need to be dulled and only the tip left sharp. I know, it seems strange, but that doesnt mean it wasnt wise. That doesnt mean it wasnt the best strategy for survival. Remember these people were poor and could not afford an array of weapons suited for each purpose.