The Loos gauge uses deflection in lbs in a given length of shroud
. You can do the same thing by measuring the amount of lbs in a certain measurement of deflection for the total shroud
. It may not be perfectly accurate but it will be close.
So, what I do is use a fish
scale and pull the shroud toward the lifeline and see how far it deflects to get the fish
scale up to a certain amount in lbs or kilos. Do the same on both sides of the boat until you have them nearly equal. Not guitar string taught but not loose either. You do this test while at the dock
. Then take the boat sailing and see if you have the shrouds tight enough not to be flopping around on the lee side when you are close hauled.
Good luck on your tuning. Thanks for using the term shroud. One of the first questions on our exams is why sailing has a different vocabulary. It is to make ourselves clearly understood.