Assuming you are referring to the McLeod tool used in automotive applications:
The McLeod is a type of clutch tool that is used to help release or engage the clutch on a car. It consists of a handle with a forked end that is inserted into the transmission bell housing. There is also a threaded rod with a knob on the end that goes through the handle and attaches to a pressure plate inside the bell housing. To use the tool, you first loosen the knob on the rod, then insert the fork into one of the slots on the pressure plate. Next, you push down on the handle while at the same time turning the knob clockwise until it stops. This will cause tension to build up in the pressure plate, which will eventually release when enough force has been applied. Finally, you remove the tool and repeat the process if necessary.