Magnet holder and system

A magnet bearing article comprising:

• a plastic magnet holder, a magnet retained within said holder, and a cavity having an opening to the exterior of said article, in which said holder and its retained magnet are located;
• said magnet holder comprising:
• a housing having a top wall located at said cavity opening, a side wall or walls depending downwardly from said top wall defining an open interior in said housing, and an open bottom, such that said magnet is inserted up into said interior of said housing;
• the interior surface of said side wall or walls of said housing including at least one retainer projecting inwardly into said interior of said housing at a distance below said top wall sufficient to accommodate said magnet between said retainer or retainers and said top wall;
• said retainers projecting inwardly sufficiently far that said magnet has to be forced past said retainers in order to position it between said retainers and said top wall;
• the dimensions of said interior space of said housing being slightly greater than the dimensions of said magnet, and each said retainer including a space to either side, such that air is allowed to escape from said interior of said housing past the perimeter of the magnet as it is forced over said retainers;
• the exterior of said side wall or walls of said magnet holder housing comprising at least one reverse sloped retainer ring designed to allow said magnet holder to be press fit into said receiving hole in said article;
• said receiving hole being dimensioned to provide a tight fit for said magnet holder;
• said retainer ring including spaced gaps therein, such that as one pushes said housing into said tight fitting receiving cavity, air escapes through said gaps, and once said housing is inserted, it is difficult to pull it out because of the tight fit with said rings engaging the sidewalls of said cavity.