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Recently I bought a PSOne with two Dualshock controllers, one being the Diamond Black PSX controller and the other the stock white PSOne controller. After a while the sticks started to drift on the black one, so I decided to take it apart and completely clean it. Note that this is for the model SCPH-1200 controller ONLY. the Dualshock 2 for the PS2 (SCPH-10010), the runble-less version SCPH-10520 as well as the SCPH-110 Dualshock from the PSOne have different internal layouts.
Step 1Disassembly
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First you need to take apart the controller, which is accomplished by removing the seven screws on the bac, then pulling the back off.