The nose of the Barnes seemed to be jammed with the wood from the center ply, of the plywood shelf. Took out my knife, and worked at cleaning the 'stuff' out of there, and it turned red.
Evidently that is the red fabric that the shelf was wrapped with. Further work with the knife revealed black stuff.
Seems that is the carpet backing. The knife got too big to fit, so used a sharp pointy thing, and worked some more.
Then some real serious digging went on for quite awhile, and the result: