Zevahim 24: Between the Floor and the Foot

The kohen needs to stand on the floor when he's doing the Temple service. When is a stone on the floor part of the floor, and when is it on top of the floor, and how is that counted with regard to the kohen's need to be standing on the floor? What are the implications of a loose stone, as a matter of the Temple's decorum? Also, a deep dive into the given that the kohanim must do the service with their right hands, and when the Torah says, "finger," it also means the right hand.