operating forces required to switch the magnetic switch and the magnetic densities of the magnetic bars these variables are very difficult to control during production for this reason the magnetic switch 50 cannot use a very precise control system the present invention uses the principle of magnetic deformation to avoid this problem fig7 a shows a magnet 40 when the magnet 40 is far away from the ferrous metal plate 48 and the housing of the solenoid the magnetic field will extend to distance h at a given strength when the magnet 40 becomes closer to the ferrous metal plate 48 the plate and housing of the solenoid acts as a magnetizer the magnetic field will extend further into the magnetizer but will shrink from a distance h to a distance h u2032 in the direction away from the magnetizer in this way the precision of the control magnetic switch can be improved because in the normal rest position the magnetic field of the magnet 40 in the direction towards the magnetic switch is reduced as a result of the magnetizer comprising the metal plate 48 and the metal housing of the solenoids this situation corresponds to that shown in fig7 a and 7d fig9 a and 9b illustrate the effect of the magnetic deformation when the two magnets 40 and 46 are moved closer to one another in fig9 a magnets 40 and 46 are a.