I have tried to align the heads with internal software, but it fails on my HP Photosmart C6180. Then I tried to do what I saw in this [https://www.youtube.com/watch?v=YwQsFBvXJ_A|video] , but I can't see the light through one (the black one) of the microscopic nuzzles at 3:22 minutes of the video after the component cleaning.
Regards!
Stefano