how to calibrate a saturn mission stick?

Hi all! I recently purchased a saturn from Ebay, and it came with a Mission Stick, 1 analog trigger grip stick, with a bunch of buttons on the one side. This is the one that looks like a flight sim stick, not an arcade stick. I'd love to use it, but the calibraition is off. It steers to left automatically when the stick is at center. I took it apart, cleaned it out, but didn't see anything to fix! :damn: Anybody got any ideas?
 
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