"I wonder why we have some people reporting that rings catch sheets and some do not.You ring catchers, is it possible you are using a spring type ring (Just 1.5 wraps of wire) instead of the split ring type (like a key chain)?"
Precisely. It was the spring type and on a boat that had just been purchased and launched. We replaced all the rings when we got back to the dock and reinspected the rig. Lesson learned.
Well - Sandusky has done a couple Macs from what I've read. So I'll listen to him. I'd call that first-hand experience.
17 MACS in fact.
My previous boat had forward lowers. We used the wrap pins on these also and never had one come off through numerous tacks dragging a large genoa around them.