How to refill Epson 604 and 503 printer cartridges?

Expression Home XP-2200 Expression Home XP-2205 Expression Home XP-3200 Expression Home XP-3205 Expression Home XP-4200 Expression Home XP-4205 WorkForce WF-2910DWF WorkForce WF-2930DWF WorkForce WF-2935DWF WorkForce WF-2950DWF and Expression Home XP-5200 Expression Home XP-5205 WorkForce WF-2960DWF WorkForce WF-2965DWF printer cartridges.