To replace the inner blade: Remove the old inner blade by grasping it firmly at both ends and pulling straight away from the shaver. To insert the new inner blade, hold the blade at both ends and press downward until it snaps into the shaver. Outer foil: Remove the old outer foil from the foil frame by slipping it off the hooks (Caution: the foil may spring out when released from the hooks). Slip the foil into the frame and guide the plastic edges facing inward. Guide the plastic edges onto the hooks in the frame.