Posted By:
Frank WakefieldI've not ever soaked a Diamond Star, maybe someone here has and can tell you if that will work.
If you don't soak, or use a solvent, you might consider sanding the mount down. I'd use very fine sand paper, wrapped around a small block, or a Dremel motor tool. Gently grind or sand a tiny bit, then stop and see where you are. Stop before you get to the card. You may well get down to a point where a moist Q-Tip will loosen the mount remnants and glue, without doing damage to the card itself.
I'd wait and see if someone says Diamond Stars will soak before trying the sanding.