MAKE A HAND CRANK DOORBELL KIT BY KOA KOA
Make your own hand crank doorbell for your room. Use the gears, bike bell, screws, washers and nuts to build a doorbell for visitors to announce themselves before they enter.
Learn the crank, the rack, the pinion, and how cog wheels work.
Turn the crank: look at the gears enter into motion, then push the hammer that hits the bell.
Once it is all put together, you can paint your doorbell. There are 4 holes on the plank so you can screw it to your bedroom door.
Each kit includes all the tools and materials you need to make your own doorbell, step by step illustrated instructions and a booklet with educational facts about how simple mechanism with interlocking gears work
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