between the inner ends of the two pin-holes

between the outer ends of the two pin-holes

between centres of the two pin-holes

between the inner end of pin-hole and the outer end of the other pin-hole

cast iron

cast steel or special tool steel

mild steel

nickel steel

along the tip to the shoulder

along the tip to the heel

along the tip to the tang

along the heel to the tang

Rasp cut

Double cut

Single cut

Curved cut

Parallel filing

Longitudinal filing

Transverse filing

Diagonal filing