Hello all. My wonderful swmbo bought me a nice Ever Ready vintage butterscotch brush ! It looked like the knot was horse hair. What I've done so far was cut as much hair out as possible and am in the process of using my dremel to get the rest out. It appears the knot may have been attached with either rubber or a black glue. I'm leaning towards glue. My question, when do I stop drilling? Or put another way, is there a sure tell sign when all the previous stuff is out? Are these handles hollow? The inner sides near the top are butterscotch while you can tell where the substance was that held the know. The area is black. I realize it's probably hard to diagnose without pics. I'll try and get some up tomorrow.