Pop top buttons removable?

I have a 1999 Dodge that is a home build but had a pop top installed by SMB Indiana. I am looking to re-do my headliner but it is locked in place by some of the pop top "buttons". I know I "can" take them off but I want them to go back up. How are they fastened?
button1.jpg vangarage.jpg
It’s not a special screw. You simply install the screw through the middle of the snap much like you put a washer on a bolt.

There’s a hole in it.

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