It may not be the bearings. The inner rotating drum has a 'white' metal 3 pronged support for the shaft. This corrodes and cracks causing the drum to become semi- detached from drive spindle. If this is the case it will need welding or a new inner drum. To dismantle remove 2 motor screws & plug, remove large pulley with centre screw, undue the concrete counter-weight & lift it up, unscrew long screw in metal band & lift off, prise off back plate at 3 points 7 , 12 & 4 o'clock , push drum spindle inwards and slide out back-plate.
pete
April 2010