Dunno whether if this question has been asked before or not,

My problem is,

My 1.5 years old PS2 SCPH 50006 ain't reading new and some old games well. It applies to my DVDs and CDs as well.
Always "Disc Read Error" or "The Red Death Screen".
But some still works well, such as San Andreas and some DVD movies.

So,
After reading numerous guides and FAQs regarding cleaning, fixing and etc. the PS2, I've decided to open up my PS2.

I opened up the black logo case, and then opened the disc case, revealing the laser. The disc tray and etc filled with dust and dirt, so I cleaned it with a damp tissue.

After that, I looked at the gadgets behind the disc tray. (I ejected the disc tray in the first place.)
Suprisingly, I found no solo "White Gear" in my SCPH 50006 to adjust the laser angle.

But what I found is there are two "White Gear"s which are responsible for DREs and RedDeathScreen. From top, there's a hexagon-like opening, maybe for a hexagon screwdriver or something.

Since I don't have the tool, so I toggle it by hand.
After an hour or so with the gears, started to get some games working.

What I wanna ask is,

1) Where can I get the hexagon-like screwdriver?
2) The "Playstation2" screen b4 the game loads seems glicthed (white pixelled, missing, and etc.), what could have cause this? (Got this prob' since a while ago, but didn't gave in any attention coz the games still can load succesfully tht time.)