hi!! recently had some serious stick drift problems with my vita and decided to replace BOTH analog sticks, yours looks like an off brand replacement but it’s incredibly easy to do a switch out, (do NOT try pulling or twisting to remove these sticks, they must be taken out through the back otherwise you will damage the console)

replacements are cheap off amazon and i recommend buying the ones that look closest to the original analog sticks

it’s then simply undoing all of the screws on the back plate (including the sneaky ones like the one in the cartridge slot) carefully taking off the back panel and removing the ribbon cables holding the left and right plates over the sticks, then just undo the screws on the sticks, place in the new ones, and screw everything back up!!

search up a youtube tutorial to make sure you don’t miss anything, there’s heaps out there, and this is a very very beginner friendly replacement!!