Hello! I am a teacher in Kuwait and we're looking to add some more engaging activity to the construction areas of our Reception/KG playground. We want to build a pulley system to raise and lower buckets of sand or bricks. We have some basic designs and we can find some pre made components here (we have to build it ourselves due to no budget available) but our concern is rope burn due to the rope slipping through little hands. Anyone with any low tech ideas for how to pull up and then control descent speed?