A magnetic screw device comprising a fastening stem , a housing , a magnet assembly , and one or more magnets , wherein the fastening stem comprises a first end , a second end , a shank therebetween, and a longitudinal axis therebetween, wherein the first end comprises a spherical or part spherical surface , the second end comprises a taper to a pointed or approximately pointed shape, and the shank comprises a thread ; the housing comprises a top end , a bottom end , a wall therebetween, and a bore between the top end and bottom end that defines an inner surface , wherein a portion of the inner surface adjacent to the bottom end comprises a concave spherical or part-spherical surface that is configured to engage with the spherical or part-spherical surface of the first end of the fastening stem ; and wherein the housing comprises a first slot and a second slot that extends from the top end towards the bottom end and is located on opposing sites of the wall ; the magnet assembly comprises a shaft , a magnet holder on one or both ends of the shaft , a removable holder cap for each magnet holder , a longitudinal axis extending between the ends of the shaft , and a sleeve adjacent to each end of the shaft , wherein each magnet holder comprises an outer surface , a bore defining an inner surface , a closed end , and an open end ; wherein each holder cap is configured to enclose the open end of the magnet holder ; wherein the shaft is removably received by the first slot and second slot of the housing ; and wherein the shaft is configured to extend between the first slot and the second slot of the housing ; and each magnet is configured to be received by one of the magnet holders . the fastening stem comprises a first end , a second end , a shank therebetween, and a longitudinal axis therebetween, wherein the first end comprises a spherical or part spherical surface , the second end comprises a taper to a pointed or approximately pointed shape, and the shank comprises a thread ; the housing comprises a top end , a bottom end , a wall therebetween, and a bore between the top end and bottom end that defines an inner surface , wherein a portion of the inner surface adjacent to the bottom end comprises a concave spherical or part-spherical surface that is configured to engage with the spherical or part-spherical surface of the first end of the fastening stem ; and wherein the housing comprises a first slot and a second slot that extends from the top end towards the bottom end and is located on opposing sites of the wall ; the magnet assembly comprises a shaft , a magnet holder on one or both ends of the shaft , a removable holder cap for each magnet holder , a longitudinal axis extending between the ends of the shaft , and a sleeve adjacent to each end of the shaft , wherein each magnet holder comprises an outer surface , a bore defining an inner surface , a closed end , and an open end ; wherein each holder cap is configured to enclose the open end of the magnet holder ; wherein the shaft is removably received by the first slot and second slot of the housing ; and wherein the shaft is configured to extend between the first slot and the second slot of the housing ; and each magnet is configured to be received by one of the magnet holders . <EOS>