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Great Ball Contraptions are fascinating and I designed two GBC modules that use LEGO slides for getting the balls up and down. The first uses a ball pump to push the balls up through the tower. The balls then roll down a double helix: The second modules uses the double helix for an Archimedes Screw. This is a very effective method of lifting balls up.
Keep the waters flowing Battle for the Reservoir (WZ2:G12) For the Desert King! The war has spread throughout much of Kaliphlin. The importance of the Flagg Aqueduct Filling Stations have not been overlooked as all factions seek to control the Parched Lands’ water source. The locals have been caught up in several attacks by warring troops and have abandoned their pump stations, hoping to keep out of the fighting by holding up in their homes. The Desert King has sent out his soldiers to deal with the crisis near the pumps; Nimueh has been sent along as an attaché to help convince the locals to accept the Desert King’s protection… Nimueh – Flagg did a good thing setting up the reservoir to bring water into the Parched Lands – it is not the desire of the Desert King to see that work undone. He will take these lands under his protection, so that your men can come out of hiding and return to their work. Village Elder – The armies and raiders traipsing through here have already ravaged our village and killed several of the workers. Yours is but a small company, what protection could you possibly offer? Troop Commander – Do not doubt the strength of the Desert King, sir. We are setting up troops all along the Gentle Curve, this entire region will soon be free of the tyranny that has come upon you. Not a one of your people will come to harm while we are here. Village Elder – Very well then, if you will keep us safe, we will keep the waters flowing. The “pump” design is based on the Archimedes Screw – powered by workers turning the screw via treading on the outer casing. Thanks for having a look .