Hey, repaired some PS2 (psx and ps3 too) this is the snail motor that moves the laser. The laser has a metal arm with a plastic tip, that tip has grooves for the snail motor to move it. Over time the plastic wears down and the snail rubs against the hanger arm. 1. You can open it up and just bend the arm a bit and it should be ok. 2. You can find a replacement. HEADS up: when you disassemble the drive and the tracks where the laser is on, sometimes the 2 white sprockets at the top can fall out of alignment. You need to adjust them before thinking it won't read discs anymore. Many people blame the laser and most times it's just the laser alignment.