I have a Ever-Ready 100T that I am restoring. I have removed the old knot and cleaned everything up. In removing the knot I did remove the shelf and understand that I will need to fill the void before setting a new knot. The opening is 21.9mm to 22mm now. I am looking at the TGN synthetic knot. I have other brushes with various badger and boar knots and am wanting to try a synthetic knot. Given the opening I am looking at the TGN 20mm 3 band nylon. Never having used a synthetic knot what would you suggest for the loft? Any help advise would be appreciated.