Made stupid mistake, Knob insert on REL

The insert(arrow) came out of one of the knobs on one of my REL’s. I am not an idiot. I made a mistake. I thought it just snapped back in. Well it is in there. I cannot shake it out but it rattles now! Any idea how I can remove it without destroying it? I just ask these things here because 50,000 minds are smarter than 1. I am not a putz. Really. At least I did not super glue it.

Never mind. Fixed! I used strong tape to remove it. Then I set it with Testors.