Rectangular buttons have less room for LEDs than round buttons -- Paradise's
Tropical Spotlight LEDs (0.458" outer diameter) work fine in round buttons, but not in rectangular buttons.
Consider using the
5mm joystick LED or the
Tropical Mood LED from Paradise Arcade Shop.
You need to modify the LED socket for 4 wires instead of the usual 2 contacts/tabs.
You also need to figure out some way to mount the LED at the proper height -- 1/4" PEX (plastic water pipe) with a wrap or two of electrical tape at the base looks promising.
Without the tape wrap, the PEX is too loose in the LED socket.
Caution:Length of the PEX (0.378" outer diameter) is critical to prevent it from shifting and jamming on the button plunger hole. (0.425" inner diameter)
You want the PEX to extend just slightly inside the button plunger hole when the button is not pressed,
especially if you use the Tropical Mood LED. (0.395" outer diameter)
Scott