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How to make a knex abacus/soraban

Picture of how to make a knex abacus/soraban
This is the abacus/soraban I made a few days ago. It works well, and I like it.
 
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Step 1:

PARTS LIST.
21 green rods
8 white rods
8 yellow rods
36 gray 4 slot connectors
6 blue 7 slot connectors
8 blue spacers
32 gray spacers

Step 2:

Picture of
abacus 1.JPG
abacus 2.JPG
abacus 3.JPG
abacus 5.JPG
abacus photo.JPG
1. connect
2. make
3. make
4. make
5. connect
6. connect





Step 3:

Picture of
It's done! I am glad I made it and I hope you like it.
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