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.

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:

1. connect
2. make
3. make
4. make
5. connect
6. connect

Step 3:

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