This is my first restore. I used a Dremel with a cylindrical grinding bit to remove the old plug. The top and bottom halves of the egg-shaped part didn't match up quite right, so I filed the seam until the edges met and then polished it up. To add some heft, I glued a penny to the inside bottom and filled the handle with Bondo. Then I ground the Bondo back down to the depth that I wanted and set the new knot with 5-minute epoxy. The knot is a 20mm finest badger extra hair from TGN.
The final finishing touch will have to wait. As soon as I can get my hands on a lacquer stick, I'll refinish the lettering on the bottom.