Pelican Real Arcade - buttons questions

I got a question after I recieved a pelican real arcade ultimate from a friend who didnt want it anymore. I wanted to know if anyone knows if that caps under the clear plastic button (the gray section with the symbols of the ps2 buttons) are take off-able, as I have tried to take them out without success.

To explain what I mean, I was able to get the top plastic out and the spring out, but the top plastic had a grey section inside of it that I could not figure out how to take it out, despite looking like it can be taken out.