The block line passes through the head of a body showing that this detail must have been carved in place. The fact that this head crosses into the spiral border suggests that this element was carved at the same time as the rest of the decoration, even if it was laid out beforehand.
The hole in the surface here is from the removal of a metal clamp in a later period. A division between two drums can be seen running across the middle of the image and this clamp was intended to hold these elements in place.
