IKRA IPM 33 TL Manuel D'utilisation page 80

Head line replacement
- Follow the sequence indicated in the figure.
Sharpening the line cutting knife
- Remove the line cutting knife (1) from the guard (2) by
unscrewing the screws (3).
- Fix the line cutting knife in a vice and sharpen it using
a flat file, being careful to retain the original cutting
angle.
- Refit the knife on the guard.
GB-36