You need a . These are smaller than Switch sticks. Search AliExpress for "PS Vita joystick replacement."
Furthermore, if during disassembly you:
: Move both sticks in complete circles to their maximum angles 3 times. Triggers : Fully depress the LT and RT triggers 3 times. Save : Press S + L2 again to save and exit. Tools and Parts Required
Unlike the Hall Effect sensing joysticks found in premium controllers (like the Gulikit KingKong or the latest GameSir G7), the original GameSir X2 uses These are mechanical components.
If you have tried calibration and cleaning, and the drift persists, or if the stick feels loose/gritty to the touch, is likely your best solution.
The is a 6/10 difficulty repair. If you are a hobbyist with a soldering iron, it is a satisfying way to save a $70 controller and keep plastic out of a landfill.
Gamesir X2 analog stick compatibility : r/EmulationOnAndroid
Do not attempt this with a butter knife. The GameSir X2 is held together with fragile clips and tiny Phillips screws.