Carbide burr, METAL SPLINTER? Try this!
This has worked for me many times, I am very careful but truthfully these little splinters are invisible, they are much smaller than the eye can see. They can fly on surfaces only to stick in your skin weeks, months or even YEARS later when you handle the object they were resting on.
I recommend OUTDOOR use only with these, and make sure cover up, and dispose of the gear when done. Disposable covers and gloves, total face shield.
if oyu ever got one, you know what im talking about