Honda UMK425T Owner's Manual page 56

4.Turn the nylon-line cutting head counterclockwise to assembly it to
the gear case.
NYLON-LINE
CUTTING HEAD
5.Make sure that the line feeding action of the semi-automatic line feed
type cutting head (see page 30).
NYLON-LINE
GRASS DEFLECTOR
CUT-OFF KNIFE
NYLON-LINE CUTTING HEAD
TAP
GEAR CASE
GRASS DEFLECTOR
Position 1
Position 2
Position 3
Position 4
Position 5
53