I just received my sterling silver brush and began to remove the silver tip knot and noticed that the inside of the brush was filled with an amber material which I was able to remove. It appears that the entire handle is hollow and filled with this material?? I'm looking for advise on what to do when I receive my badger knot form (TGN) to install into this unit. Should I continue to remove the amber material and refill the area back with this material to a height where the knot will sit perfect or just add epoxy to the amber material to make up the height difference in the cavity prior to installing the knot. By the way does anyone know what amber material is used in this process??