Dynamo Cabinet Push Buttons – How to disassemble?

I was dinking around with my Tetris Dynamo cabinet this morning, and I got on a kick to clean the buttons. They have all the dirt and the grim on the sides that make it so they hardly work.

However, after I took the buttons off, they didn’t have the typical bottom where you would have a micro-switch, and I could not for the life of me figure out how to take them apart.

Here are some photos;

Does anyone know what types of buttons these are? They have an “IL” printed on them. I would like to take them apart to clean the buttons up easier.

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