a portion of the length of the rod the second closure member is coupled to the first end 34 of a second rod 36 the second rod has magnets 38 preferably permanent magnets along the length of the rod or at least along a portion of the length of the rod the magnets are preferably positioned such that the magnetic fields of the magnets alternate along the length of the rod for example a line of magnets may be positioned such that the magnetic field is in one direction and a second line of magnets may be positioned such that the magnetic field is in the opposite direction one embodiment of this is to use the same type of magnet but to alternate which side of the magnet faces outward from the rod the rod may have a cross sectional area that is circular or one of many shapes including triangular square pentagonal hexagonal heptagonal or octagonal shapes with flat sides may be easier to construct as the magnets can be attached to a flat surface as opposed to a curved surface each of the rods is situated such that a second end of the rod is at least partially disposed within a glider assembly the second end 25 of the first rod is disposed at least partially within a first glider assembly 29 the second end 35 of the second rod is disposed at least partially within a second glider assembly 39 the first and second glider assemblies comprise means for generating an electromagnetic field the electromagnetic field may be generated by coils of wire positioned along the length of.