It's important to realize that Mathis' main goal is for physics to remain physical; i.e. mechanical. He has little patience for virtual particles or forces. Real forces are created by real collisions of real particles with either linear or spin velocities or a combination of both. His charge field is the fundamental field of all physical interaction and is mediated by photons with real extension (size) and mass. There is no such thing as a 'point' particle; you can't have something at a 'point'. This field is roughly equivalent to Maxwell's displacement field and is what drives E/M forces. The linear velocity of the photons create the electric field and the spin velocity creates the magnetic field. This fundamental field is in vector opposition to gravity and what we call 'gravity' is actually the resultant field composed of both the charge field and true gravity; thus, unification was achieved in the first instance by Newton and Coulomb but nobody realized the two equations were equivalent.