283
A
D
B
C
C
A
A
 
Mainsail Reefing 
Dual Line: This dual-line system is common on boats 9 m (30') and larger.
Position blocks so line pulls down and out to keep the sail flat and prevent 
lateral loads on the luff rope or luff sliders.
Lazy Jacks: Lazy Jacks contain mainsails during reefing and dousing. 
They work exceptionally well with full-battened mains, but are also used 
with conventional sails.
Typical boat length:
Small Boat:  
6.7 - 8.5 m (22 - 28')
Midrange:  8.8 - 10.4 m (29 - 34')
Big Boat:  10.7 - 12.8 m (35 - 42')
Diagram
Ref.
Description
Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
Dual Line
A
Cheek
2644
6237
3220
B
Single
2650
2600
3215
C
Mastbase block
222
1986
1988
D
Bullseye
339
237
237
Lazy Jacks
A
Lazy Jack kit
252
253
254
Part numbers represent hardware most commonly used.

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