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From The Great Ball Contraption Wiki

A great ball contraption rake pushes or pulls balls up a ramp. Also called a sweeper. The mechanism can be seen in this animation:

Rake mechanism animation

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MOC builder explanation given image available video available instructions available follows GBC standard
Sweeper Philo no http://philohome.com/gbc/gbc-sweeper.htm http://philohome.com/gbc/gbc-sweeper.htm no yes
Facts about "Rake"