While it is determined that "the location of the grip is located two-thirds from the top," the actual grip is not located exactly two-thirds but approximately at three-fifth.
実際の所、“握りの位置は弓の上部から約3分の2”とはあるが、実際の握りの位置は厳密に3分の2の位置にはなく、大凡5分の3辺りにある。