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Step 7Advanced model
For the pro model, use a section of candle as the spacer/washer, and wrap the 'wheels' in more rubber bands.
Use your imagination: how about a soap washer? Would a longer pencil work better? How about linking two tanks together so they don't run in circles?
Have fun.
Use your imagination: how about a soap washer? Would a longer pencil work better? How about linking two tanks together so they don't run in circles?
Have fun.
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