@NaXuN
Thanks for the elaboration. I know about the screws you are talking about and in some old models I have seen those screws. But in Corolla 2009, I could not locate them. and one more thing since the headlights contain two bulbs, one for low beam and one for high beam, are there separate screws for each one of them or there is only one screw for both the bulb of same headlight.
Thanks,