More often than the erratic signal from the stick is coming from the source, the pots. They get dirty or worn in one area and you'll get odd results when the stick travels in those directions. Getting at the pot involves removing the little rubber bumpers on the bottom to expose some Phillips screws. The bottom cover holds a cradle together that holds the pot. Slip it off and the pot will come out. It's attached with little spade connectors. Keep track of which colors go on which post. Once the pot is out, spray it with some contact cleaner while moving it back and forth. That should do it. If you really wanted to get ugly you could bend the little tabs open and take the pot apart. I've done that a couple of times.
Looking forward to my new controllers that will have hall effect sensors. Contactless-- so nothing to gunk up. All this will be a thing of the past!
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