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This is a nice k'nex ball machine lift. This Idea was by Shadowman, it's just my design and i also made an instruction. Enjoy!
First you'll make the wheal.
Now you'll make the rest.
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
The Official Guide to Knex Ball Machine Liftsby Shadowman39
Project Accuracy-A K'nex Experimentby MechanicalCreationMaster
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