Harken 7413.10 MKIV Jib Reefing & Furling built after Feb. 2009 - Manual (Page 14)

Assembly Top Foil
Deburr inside edge using rat-tail file.
Cut foil to length using hacksaw.
Prepare top foil for drilling.
Tip: Mark top foil to distinguish
from cut-off piece.
Scribe line on top of foil to mark drill holes.
Lay top foil alongside cut-off piece and use
a flat metal object (i.e. metal ruler) to scribe
top line of foil.
14 MKIV units 3, 4