The only way they are rebuildable is to find a motor repair shop that is willing to tackle it. Chance of finding somebody to do it is slim and none. Also have to take into account that sometimes they will use odd size bearings. Like for instance they may use the outer race and seals for a 6204 but use the inner race from a 6305 So you may think it is a 6204 bearing but in reality a 6204 may have the correct outer diameter but the wrong inner diameter.