Does anyone know where to get a 14mm - 15mm brush knot? I need to replace one in a Gillette travel brush and I can't find one.
You can get a 16mm boar or badger knot from TGN. You might be able to sand it down to fit if it is too big. Maybe Omega makes a tiny brush you could poach a knot from. https://thegoldennib.com/boar-hair-knot-16mm/
I recall a previous thread where a gentleman did a restore on the same brush you are about to do.... It was Frank Shaving whom he went through for brush knots. https://theshaveden.com/forums/threads/16mm-in-the-house.62550/ and https://theshaveden.com/forums/threads/straight-boar-knot.62422/