If you need to dump your weights, rethreading the ripcord should be the least of your worries! If your sister and brother-in-law are dropping their weights often enough for rethreading to be an issue, please advise them to stop diving until they get more training. I've been diving for ten years and close to 500 dives and have needed to drop my weights exactly zero times. The time it takes to rethread the system is a non issue. I can rethread the ripcord in less than five minutes, I think it's the perfect solution to integrated weights. No pockets to purchase, so no worries about losing an $80 weight pocket that may not even be available anymore and the system is dead simple.