A method of retrofitting a magnetic centerguide to a grid. The grid is of the type adapted to carry a pan along a path defined by a conveyor to which the grid is attached. The centerguide is of bifurcated construction which is split at one or both ends of its structure in order to allow it to be maneuvered about the grid structure for partial assembly. After being partly assembled, a fastener secures the bifurcated portion together to provide a magnetic centerguide in which the underside of a magnet is attracted to and thereby guides a pan when placed on the grid.