It takes a lot of mechanical advantage to = a hydraulic adjuster. While I had mine off for a rebuild, I had a 4/1 (not really much) on the backstay and it would not even affect the headstay sag. The hydraulic will pull the headstay, and I can bend the mast on my J/34c (masthead rigged) completely out of column if I want. I like my hydraulic. I had Westmarine rigging shop rebuild mine.
Jboat J/37c (new to me Jan 2011); J/22 #1003
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