If the lifted splinter is on the edge and too small to capture on camera, you can probably just round the edge some more to get rid of it. Blend it in nicely, and make sure all corners are rounded. The corners of a rectangle hardly contribute to the mechanical stiffness of the wood, yet they do contribute to the danger of lifting splinters to a great extent. I.e.: rounding the corners of a bow results in hardly any draw weight loss.