b'Single-Acting Integral Backstay AdjustersHarkens integral hydraulic backstay adjuster provides the power to optimize sail shape quickly for racers and adjust mast tension for smoother furling for cruisers. The cylinder features a built-in, single-acting pump.Every unit includes a hardcoat-anodized aluminum cylinder andHarken recommends pump, valve, and stainless pump handle with two attachmentattaching a toggle to options: 1) a roll pin, that when installed, locks the handlethe cylinders bottom permanently, 2) the roll pin can be left off and the handle may beclevis to accommodate 2.5325 IN inserted when needed, but stored separately. Cylinders include astay movement. Standard clevis pin on both ends. A fiberglass position indicator attached toeye-jaw toggles fit all 6.2317 IN the top clevis pin slides down the cylinder as its retracted forHarken cylinders.repeatable tension settings. Standard eye-jaw toggles fit all Harken cylinders and are recommended on all installations.The pressure-release knob turns clockwise to close and pump, counterclockwise to release. When closing the pump, the knob cannot be over-tightened by hand, preventing damage to the valve. Release speed depends on how far open the knob is turned. Pressure relief is factory set to prevent crew from over-tensioning the backstay. Harken integral backstay adjusters come in four sizes to fit boats 9 - 18 m (30 - 60\') with stay diameters of 5 - 10 mm (7/32 - 3/8"). Supplied fiberglass position indicator provides easy visual reference to duplicate desired tension settings.For replacement position indicator assembly, order part number H-85275.We got the backstay measurement right for how we sail the boat and we plugged in the new integral unit. We won our first regatta. So no complaints. David JarvisJ-105 Hey Jude Toronto, CanadaWine & Spirits, GS 48, 14.90 m (48.9\')Fabio Taccola / Grand Soleil YachtsMaxPin center lengthGap/pinPart wireStroke (closed)* Weight**Pull force No. - Size in mm in mm in mm lb kg in mm lb kgHCI006BCC -67/325.514.17360307628.363.797/1611.137701710HCI010BCC -109/32714.17360307628.363.791/212.747102136HCI012BCC -125/16814.17360307629.724.415/815.967103043HCI017BCC-173/89.514.17360307629.724.415/815.983903808*For pin center length open (PCLO) add stroke length to pin center length closed. **Rod ends (forks) included in weights.Relief valves are preset to limit max tension (pull force) to recommend rigging loads and cylinder design limits. Each cylinder provides a specific max pull force.27'