So here is what happened - I used the pliers method and the whole volume knob came off. I am not sure how to wiggle the silver ring and not pull the entire knob out while the trim is still installed on the car. Anyway that gave me the opportunity to just push the black plastic part out from the back and install the new crystal one. Then here comes the tricky part - there are 4 tabs on the back of the volume knob and 2 are clips and 2 are just pointy tabs and they have to be aligned on the inside and then give it a hard push - almost like a punch to the volume knob and it will click in place. End result is as below:
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