Originally Posted by Pantah

FYI, those bearings can still be easily found, bearing code is 6003-RSR or 6003-2RS, the latter of which is more common. The suffix, those last 3 digits (2RS) aren't as important, it's been my findings that they have to do with how the bearing is sealed. The 6003 is the important part as that dictates the physical dimensions. The bottom bracket spindle is effectively a long, straight, pressed in metal shaft. A basic hydraulic press can get it out.