Tuning guide for International 420 - 2011 Base setting for Superspar M7 - Nautivela Jib wire tension Shroud cable tension Spreaders length SETTINGS Mast rake Mast prebend Shroud tension Mast step Chocks (from neutral) Zaoli Sails One design 22-24 Loose PT-1 29-31 Loose PT-1 470mm-475mm 3mm dyform cable. 3mm dyform cable. 0-8 knts 9-13 knts 14-18 knts 19-23 knts ≥ 24 knts 6,13 cm 42 mm 31 41,5 cm 0 to 1,5 cm 6,09 cm 40 mm 31 41,5cm 1 to 2 cm 6,04 cm 38 mm 30 42,5 cm 1,5 to 0,5 cm 6,00 cm 42 mm 30 42,5 cm 0,5 to 0 cm 5,98 cm 45 mm 29 43,5 cm 0 cm to - 0,5 zaolisails.com/onedesign