PSP 300x Analog Stick Replacement - iFixit Repair Guide
A tale of two mods: different PSP joysticks | Engadget
1pcs 3d Analog Joystick Thumb Stick Grips Cap Button Module Control Replacement Repair Part For Sony Psp 1000 1004 1008 Psp1000 - Joysticks - AliExpress
How To Fix Joystick Drift on a PSP! - Joystick Replacement - YouTube
Repair a Wandering PSP Analog Joystick : 13 Steps - Instructables
How-To: Craft an analog control stick for your Sony PSP (part 2) | Engadget