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The instructions that came with the gage say you should tension the rig at the dock (several tension values are given depending on your rig). Then you take the boat for a sail in a stiff wind and basically tune the rig so that the lee shrouds do not go slack (dynamic tune?). As long as there is no slop in your rig including mast pumping, and the tensions are close to what is considered typical, rig should be considered well tuned (assuming rake and mast bend are acceptable).
Here is a interesting article in Practical Sailor regarding tunning.
Practical Sailor - Boat Clinic: Tuning the Masthead Rig - Tips Article
It says: "If you have absolutely no slack in the leeward Cap Shrouds going upwind in 12 knots of wind, the shrouds are probably too tight for most boats."
I just tunned using the article and seemed to reach the prescribed tension (according to Loos), and I've got a lot of slop in the Leeward shrouds in those conditions. The PS article also differs for the technique used by Dedekam in several respects. I'll bet if you asked three different Riggers, you would often get three different opinions. So, paying someone to do it isn't necessarily the answer either!
Last edited by L124C; 04-04-2012 at 10:37 PM.