Um, I'm not a sailor, but just wondered if sailors might be able to help with a treehouse problem. I have a pulley and a bucket, so the kids can haul stuff up, but I suspect I need some sort of brake, so they won't lose control of the rope. Would a ratchet block do the job? Any suggestions would be GREATLY appreciated. Everyone I've asked gives me a blank look, and says "pulleys are a lost art."