Correct Removal of Driver Side Door Handle Blank Out Buttons?

[mphilleo]

On my 1991 Volvo 940 Turbo, I'm having a beast of a time removing one of the driver's side door handle "blank buttons" so I can get something out behind the A pillar trim. It's very loose and I can see the white clip and solitary screw holding it on, but it just won't budge, hard as I dare pry. Are there any reference pictures of the clip or any way I can remove it without breaking it?