I am planning on lapping my T.Tower 120 also but i need to know how do you tell that the surface is exactly even. I know the razor blade trick but can you visually 'see' the surface being even when you lap? I'm asking since i lapped my Freezer 7 pro and well some ppl told me to do about 10 reptitions and turn the HS and repeat but sometimes the surface is still uneven. I gues the question is do you go with the repitions or with wat your eyes see?