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Shroud tensions measured on RT-10 Loos gauge
» Download North's Quick Tune Card (pdf file, updated May 2014)

© North SailsHeadstay is measured using swing arc method. Use jib halyard pulled down to top of black band on mast - swing forward to mark headstay. Measure distance from mark on headstay to deck at stem.
© North SailsThe mast butt is measured from forward face of mast to aft edge of bulkhead. This corresponds to forward most position in the slider.
© North SailsPre-Bend is measured at point of maximum deflection between S1 and S2 (left).
 
© North SailsJ Dimension is measured from intersection of stem at shear to forward face of mast (left.)