Ratchet and Clank: Size Matters Easter eggs

clanks head
when you enter clanks head go by the metacorp ammo/guns box before zip lining down zoom with any gun in front of you,you'll see a titanium bolt there to get it kill the few bad guys on the platform below then go in the room with the 3 litte men kill them before going into the next room go by the door where you came from look up you'll see a little square hole in the wall, wall jump side to side and you'll a the titanium bolt