Even after the Yaen is assembled, it is a nut-shaped toy that is very easy to adjust the balance. The center miso is not a "V Miso" like a typical divibishi, but it has been treated with a "deep U Miso" processing that is easy to set on the shaft of the yaen. You can easily set it up by simply placing the shaft on this hole and pressing 3 to 5 points with pliers.