I tried the magnets today and all the ones I tried fit in my two switches. But after looking at how the switch works, I realized that the spring actually helps complete the circuit. With the magnets, the button cap has to touch the inside wall of the button housing or the top of the housing to complete the circuit. It's fine if you don't mind putting side pressure when you depress the switch but I found it to be a pain and hit or miss. With the spring, current runs up the button axis to the button cap which is in contact with the top of the spring. The bottom of the spring is in contact with the bottom of the housing which of course is screwed into the body completing the circuit. The magnets create a gap in this connection.