Nacra 500 MK2 Assembly Manual page 100

7.
Lower the sail while taking the hanks of the sail. If
possible, roll the sail while lowering to avoid creases.
8.
When the sail is down, detatch the shackle from the top.
9.
Tie the top shackle to the loose end of the 3mm line
and tie away the line away from the mast.
100.