Gear of the Knitty

This is gear to register the knitting stage.
Please combine this with the two gears and the two rods.
I made this because while I was knitting something, I was prone to forget the knitting stages.
To register two digit numbers two gears and two rods are needed.
Please write a number from 0 to 9 respectively on the gear tooth.
Rotating it with the knitting stick or your finger lightly and reading the top gear tooth, you can register the knitting stage.
The shape of the hole of the gear is able to not only move smoothly but also stabilize.