How to Build Working Gears from Junkmail and Cardstock

Step 7 Poke Holes

Use a thumbtack to poke a hole at the center pivots on either side. This is to ensure that the gear doesn't go off kilter when it begins to turn.

Repeat the steps and test it out on your wall surface or corkboard. These gears can stack on each other, so if you have a pin which is long enough, try making multi dimensional mechanical devices.

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