282
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 back-
stay 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, deliver-
ing oil twice as fast as single-acting pumps—
an excellent choice for racer/cruisers. 

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