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I have no idea what this is. It has a screw thing on top. Any knowledge is appreciated.
It's the rounded blue part; the screw part is white and has “SO2” written on it.
Looks like an out of focus broken trimmer pot.
Did it origionally look like this? The S02 is probably 502, a 5k ohm pot.
image from Banggood
Required, but never shown