Made cool!
A great start

I did only 2 times when I wanted to repeat the concave bevels
of Dozier and 1 small knife.

Depends on the quality of the file itself.
Modern sometimes have only a surface hardening or nitriding on old.

So it turned out that the knife with the concave descents well holds sharpness,
and the small one - in the center soft.

My friend taught me, but I have not tried it yet
(he lives too far to travel often to him, he has a bugle and an anvil).

It is necessary to completely anneal the steel,
to eliminate the difference in heat treatment,
make steel soft then engage in forging or grinder,
then only after did heat treat.