The AXIS has two clips on each side attached to the thumb sticks.
It has 3 pin for bi-direction. (left right or up down)
You can use a multimeter tip or small metal clip to bridge the 1 2 3 pins between one another and the signal
will do left right or up down.
I used a app on the device as I was trouble shooting to watch the stick movements and once I came across this
article and was able to get the correct part name, I was able to see how this axis part actually worked an gave it a shot.
Inside the axis is a aluminum discs with a plastic mold.
I had to reseat the disk using tweezer.
(This requires some slow movement as you remove it or reseat it as the metal is very thin)
This allowed the analog stick to zero/center itself and didn't keep it stuck to one direction again once you moved it.
I found a replacement part at DigiKey "THUMBSTICK DUAL AXIS" was the search term for a proper donor
part fix to replace the fault axis sensor as the SteelSeries Nimbus analog thumb is imbedded to the rocker and
not screw affixed so it wasn’t changeable.
I'm not sure how long the temp fix is gonna last.. (going on two days now).
So best to replace the axis sensor at some point without having to mess with thin disk as a backup plan.
But this worked for me while the part to come via snail mail.