Magnetic circuit and method for use

A method comprising:

• providing an apparatus to a user, the apparatus including:
• a body having an open end and an at least partially cylindrical inner cavity defined by an inner surface having an inner side surface and an inner end surface opposite the open end, wherein an at least partially electrically conductive shaft is receivable by the inner cavity;
• an electrical contact positioned on the inner surface such that the conductive shaft is in contact with the electrical contact when the conductive shaft is inserted into the inner cavity;
• one or more side magnets disposed in a magnet recess in the inner side surface of the body such that the one or more side magnets are recessed from the inner side surface, the magnet recess parallel to the inner end surface and positioned such that a shaft recess of the conductive shaft aligns with the magnet recess in the inner side surface when the conductive shaft is inserted into the inner cavity;
• inserting the conductive shaft into the cavity of the apparatus, the conductive shaft having a recess;
• applying an electrical signal to the electrical contact and the one or more side magnets;
• determining whether a circuit has been completed between the electrical contact and one or more of the side magnets, wherein the circuit is completed when a metal ring is attached around the conductive shaft at the recess and not completed when the metal ring is not around the conductive shaft;
• and
• providing one or more signals to the user based on whether a complete circuit has been detected.

An electronic circuit, comprising:

• a memory;
• one or more processors operable to:
• provide an electrical signal to an electrical contact and one or more side magnets, the electrical contact and one or more side magnets provided in an apparatus, the apparatus comprising:
• a body having an open end and an at least partially cylindrical inner cavity defined by an inner surface having an inner side surface and an inner end surface opposite the open end, wherein an at least partially electrically conductive shaft is receivable by the inner cavity;
• wherein the electrical contact is positioned on the inner surface such that the conductive shaft is in contact with the electrical contact when the conductive shaft is inserted into the inner cavity;
• and
• wherein one or more side magnets are disposed in a magnet recess in the inner side surface of the body such that the one or more side magnets are recessed from the inner side surface, the magnet recess parallel to the inner end surface and positioned such that a shaft recess of the conductive shaft aligns with the magnet recess in the inner side surface when the conductive shaft is inserted into the inner cavity;
• receive a feedback signal indicative of whether a closed circuit is formed by the electrical contact, at least one of the side magnets, the conductive shaft inserted into the body, and a metal ring attached around the conductive shaft;
• and
• provide an output signal to a user based on whether a complete circuit was detected.