Hi
What do you want these points for ?
The forces from the rig is not just those at the mast , wires take most
anyway and when you calculate the forces they are often situated at the
first third of the main sail, not at the mast --- even unstayed masts
distribuate the force to a rope at the far corner of the sail acturly
these forces can be bigger than those affecting the mast that then pull
the wires in the rig.