I bought a broken PS4 controller V2 (model: CUHZCT2E) for AUD$23 delivered.
I attempt to repair or replace the broken analog sticks.

Full disassembly How To.
How to safely open the PS4 controller without breaking the 4 clips.
Analog stick cleaning, sensor cleaning, analog stick replacement.

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If the following Tools and Parts lists helped you, please considering leaving a comment :)
(not affiliate links)
Parts List:
Replacement analog sticks eBay (scorpio2001)

Tools List:
Phillips Head screwdriver size #0
ChemTools Isopropyl Alcohol 100% https://rmscomponents.com.au/shop/az...
KingBo Flux Aliexpress
Yihua 936 Soldering Iron (i now use the Hakko FX888D)
Yihua 2008D Hot Air Rework Station
Custom fume extractor    • DIY Soldering Fume Extractor using a ...  
60/40 Solder JayCar Electronics
Solder sucker
Desoldering wick/braid https://www.jaycar.com.au/30mmgoot...
Kapton Tape eBay
Metal spudger/pry tool eBay
Plastic pry tool eBay
Precision pliers Dick Smith Electronics
Nylon tweezers eBay or Aliexpress
ESD Tweezers eBay
Cotton buds/tips (i recommend using foam versions of these, as they don't leave fibers behind)
Black Nylon spudger eBay, ETradeSupply or WitRigs.
Microfiber cloths eBay (amazingshopping2013auusername)
Paper towel