There are 8 different positions to readjust vidias, multiplying by 8 the life utility of the knifegrinder.

1.-To proceed to eliminate the surplus side of the knifes, until they take the form of V that demarcate the two vidias.
2.-To pass the knife with smoothness (approx 6 times) sliding the knife...

It is born to satisfy the needs of the landlords activities professionals, meat, butchers…