McCulloch MAC 250 B Instruction Manual page 14

WARNING:
Never use wire, rope,
string, etc., which can break off and become a
dangerous missile.
5. When installing new line on an existing
spool, hold the spool as shown.
6. Bend the line at the midpoint and insert
the bend into the slot in the center rim of
the spool. Ensure line snaps into position
in the slot.
7. With your finger between the lines, wrap
the lines evenly and firmly around the
spool in a clockwise direction.
8. Position the lines in the guide slots.
Guide slot
9. Place the spool in the cover as shown
below.
Slot
10. Insert the ends of the lines through exit
holes in the sides of the cover.
11. Reinstall the spool and cover onto the
trimmer head. Push until cover snaps into
place.
Guide slot
14
Line exit hole
Cover