black official gcn controller has smaller range of input on right

I recently got a used black official gcn controller, and when playing super monkey ball, I noticed I was going slower to the right than to the left. The controller adjustment screen showed that all directions EXCEPT the entire right side were fine, with the right side being off the edge of input by maybe 1/4 or 1/5 from the edge of the input rectangle. I have tried to recalibrate the controller, but to no avail. Any way to fix this without buying a new controller? Any input would help. Thanks for reading!