The necessary condition for the stability of incense on the hand is that the fulcrum (the point where the finger supports the incense) is in a straight line with the center of gravity, and the fulcrum is above the center of gravity. His rosary hanging position must be on the right side of the fulcrum (according to the photo position), so that the heavier rosary will move its center of gravity under the finger, and because the rosary is hanging on the right side, its center of gravity will move to the right side directly below the fulcrum (if it is not directly below, the angle of incense will be automatically adjusted to directly below). The key is that the beads should have L-shaped pendants (or similar objects) to move the center of gravity of the beads to the right.