267
4:1
8:1
6:1
A
B
12:1
2:1
6:1
A
B
C
A
A
B
C
A
A
B
C
A
6:1
A
A
B
B
B
C
D
E
F
A
Backstay Adjuster
6:1 Right Angle: This simple 6:1 
system is used on small cruising boats 
with a single line or wire backstay.
12:1 Cascaded: This cascading 2:1/6:1 
system provides a 12:1 purchase and is 
used on small racer/cruisers and daysailers.
4:1 Split Backstay: This 4:1 system 
is used on small keelboats with split 
backstay systems. Pinching the wires 
together tightens the backstay and 
increases headstay tension to flatten 
the genoa, decrease weather helm, 
and stabilize the rig in heavy air.
8:1 Split Backstay: A more powerful 
version of the split backstay adjuster 
uses a doubling wire running through 
a wire block for a purchase of 8:1.
Diagram
Small Boat
Midrange
Big Boat
Ref.
Description
Part No.
Part No.
Part No.
6:1 Right Angle
A
Triple
2640
—
—
B
Triple
2648
—
—
12:1 Cascaded 
A
Single
300
—
—
B
Triple
344
—
—
C
Triple
347
—
—
4:1 Split Backstay
A
Single
304
308
—
B
Fiddle
2621
2621
—
C
Fiddle
2624
2624
—
8:1 Split Backstay
A
Single
304
308
—
B
Fiddle
2655
2621
—
C
Fiddle
2658
2624
—
6:1 Double-ended Split
A
Single
300
304
—
B
Single
340
2600
—
C
Double
342
2602
—
D
Stand-up
349
2652
—
E
Cheek
350
2644
—
F
Cam cleat
150
150
—
Double-acting Hydraulic Backstay Adjuster
A
Backstay adjuster
—
HCI025110345BCC.NG
HCI035130345BCC.NG
HCI040160385BCC.NG
HCI045160385BCC.NG
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')
Part numbers represent hardware most commonly used.
6:1 Double-ended Split: This double-ended 
split backstay system leads lines forward 
to cam cleats mounted just ahead of the 
helmsman so adjustments can be made 
from either side of the boat.
Double-acting Hydraulic Backstay Adjusters:
These powerful systems deliver oil when 
the handle is pushed and pulled, delivering 
oil twice as fast as single-acting pumps—
an excellent choice for racer/cruisers. 

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