Last month I decided to do a little project with three handles.
The first was an Ever Ready 150 which I decided to drill out the knot and replace it with a 20 mm Best Badger and weighted the handle with six nickels for ballast and heft.
The second was a Rex which I decided to drill out the knot and replace it with a 22 mm Best Badger (required that the knot be enlarged) and weighted the handle with seven nickels for ballast and heft.
The third was an older model Burma Shave brush made before the production was transferred outside the U.S. This brush is the old Ever Ready C40 mold made after ASR folded all traditional shaving items under the Burma Shave brand. To remain at the same level and knot size the knot was drilled and removed and no additional ballast or drilling was done. The knot sits on the original shelf.
The pictures will discuss the knot and loft sizes.