Amazon.com: ElecGear 4X Replacement Joystick (EL6 ALPS 2.1K) for PS5 / PS4 Wireless Controller, Analog Stick Controller Sensor Assembly Thumbstick Module Work with DualSense and DualShock 4 Controller : Video Games
Victor Duarte - PS4 Controller Assembly
The taking apart and putting back together of the ps4 controller (R2 and L2 toggle spring) - YouTube