How are you supposed to remove plastic button covers Otari MX5050BII-2?

Blue Jinn

Rider of the ARPocalypse
Specifically, the ones on the left for reel size and speed. I have a bad relay on that circuit board. I have a parts deck and all the connections on the board are socketed so I can black box the change, but it's like the plastic parts are stuck on with some space age star fleet glue! Are they glued? How much force can I use? I can live with only using large reels, but I have about 100,000 feet of tape on 7" reels it would be nice to use.
 
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