Have adopted Cain Poulter's suggestion of using a long old sock fed round the lower end of hub and top of rebound spring to remoce excess old grease. Held tight and pulled from side to side it removes the grease without smearing inside of disc.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone