279
C
D
A
B
A
B
D
F
A
B
C
D
A
B
C
Mastbase 
& Cabintop Blocks
1 Halyard: This simple system leads principle halyards aft. Used 
by boats under 9 m (30').
3 Halyards: Larger boats use special mastbase halyard lead blocks. Lines are routed out to 
deck organizers then aft to stoppers and winches. Stand-up blocks on a base are sometimes 
preferred for their complete articulation, but they hold halyards higher off the deck than 
specialized mastbase blocks.
6 Halyards: Modern race boats lead halyards and control lines straight aft through deck 
organizers so they can be used on either cabintop winch.
Over-the-Top: Special “over-the-top” blocks are required to route lines over an 
outside corner like the front of a doghouse or coaming. 
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
Small Boat
Midrange
Big Boat
Ref.
Description
Part No.
Part No.
Part No.
1 Halyard
A
Mastbase
222
1986
1990
B
Cheek
2644
2606
3220
C
Single
2652
—
—
D
Flip-Flop
2142
3122
1987
3 Halyards
A
Mastbase
222
1986
1990
B
Deck organizer
9001
9001
9006
C
Winch
20.2PTP
35.2PTP
40.2PTP
D
Single
2636
2660
1540
E
Stand-up spring
097
071
1634
F
Stand-up
2652
3227
3244
6 Halyards
A
Mastbase
1986
1988
1990
B
Deck organizer
9001
9006
9006
C
Winch
20.2PTP
35.2PTP
40.2PTP
D
Crossover
—
1984
1981
Over the Top
A
Mastbase
1986
1988
1990
B
Mastbase
1986
1988
1990
C
Mastbase
3002
3002
3002
Part numbers represent hardware most commonly used.

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