The object of Fine Tuning is to have the mast “in column” (not bent fore or aft or athwartships when sailing in conditions typical for your area. This is accomplished through adjustments to the lower shroud turnbuckles. Here are some points to look for:
1. When sailing on port tack, sight up the mast from the base. If the middle (where the spreaders are) is sagging to leeward take up equally on both port lower shrouds until the mast is “in column”. Repeat this procedure on starboard tack.
2. If, when sighting up the mast while on port tack, the middle is bent forward (but not to leeward) take up a turn on the port aft lower shroud and let out a turn on the port forward lower shroud turnbuckle. Reverse these adjustments if the middle of the mast is aft of the “in column position”.
If there are any unusual kinks or twists in you mast, stop sailing and consult your dealer for advice.
All rigging wire used on yachts has a tendency to stretch, especially after you have sailed in heavier wind than you normally experience. Therefore, you should periodically check the tension on the shrouds and stays, tightening them up if it is required.
Repeated trials and help from an experienced sailing friend will lead to a properly “tuned” mast. After you have made you adjustments to the stays and shrouds, it is suggested that you give the turnbuckle locking caps a slight snugging turn with a pliers.
Do not turn them more than about 1/8 inch or less or they may break or split. This snugging action will prevent vibration (or sheets rubbing on them) from ever loosening them up. Check the snugness of the locking caps before each day’s sailing.