Does your rigging have this?
I have a stopper on each of my main shrouds that appears to stop at the top side of the spreaders. It looks like it is intended to put more tension on the under-spreader portion of the shroud than on the above-spreader section. I don't know if this is common or not, but I can't find any mention of these in any tuning articles.
My question is, is it true that these are used to put more tension on the lower half? If so, any advice on how these should be tuned?