I started carrying a Park CT-5 a few years ago and have used it twice on club rides. Once to help another rider by removing the mangled part of a dropped chain and then joining the non-mangled ends back together. Got my hands dirty but she was able to finish the ride. Second time I let a stranded rider use it to fix his chain. Can't remember his problem but he was able to fix it and finish the ride. Kept my hands clean that time.