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Have seen leg above ankle right to the bone. does it count?
Otherwise at present I do not have any scythes but as my frien recently died and the anvil and the scythe peening hammer were left in his...

How it was explained to me was that the acidity from the manure would thin the blade while also protect it from further rusting, but I am not sure how it would work. What is the fact I have seen them...

I remember many hours of watching my friends dad peening them. Could not get my head arround maturing new blades burried in manure.
To return back to the original hone. I had few simmilar in my hand...

For the same reason as why do you need multiple razors.
On the more serious note. There are types which are better for heavy work (wheat) or light work (grass)