We are purchasing a new main for our 1991 Legend 37.5 to replace the old, original main. Our two line Dutchman worked fairly well on the old main, except the aft end of the sail would always fall off the boom. We attributed the "fall off" either to the fact the main was old and had lost its memory or the need for a third dutchman line. Just to be safe, we thought we would go with the third reefing line on the new main. The sail maker had another way to handle the "fall off" issue. His idea (which apparently has been around for a while) was a couple of rings that could slide up and down the topping lift. Each ring would be attached, by way a short piece of line, to a point on the roach (probably the point where the sail should rest on the boom when it is flaked). The theory behind this is as the sail is being raised, the rings slide up the topping lift without restraining an already difficult main to raise. As the sail is lowered, the line-ring combination would prevent the sail from falling off the boom. This sounds like it could work. The sail cover would still fit as the lines would lie flat on the boom when the sail is down. It does not seem like the line would snag on anything while being raised, although there appears to be potential for the rings to hang-up on the hardware at the end of the boom. Also, this arrangement should not hinder reefing. Has anyone had any experience with this system or the third dutchman line in a Legend 37.5?