The Hakko 40/40LP Magnet moves back and forth with the diaphragm.
It holds the diaphragm secure and vice a versa. Typically the magnet is
very long lasting.
However if you run the air pump with bad diaphragms for extended
periods you could wear down the magnet. If you open the motor for repair
and you find dust or small metal particles you may need to replace the
magnet. Always inspect the magnet for wear and tear when you replace