Spindle replacement for A.O. Smith motor

Hi everyone,

I have an A.O. Smith motor, model K48N2N104 (specs below), and I need to replace the spindle portion of my unit (spindle, fan, bearings, squirrel cage). Everything else on the motor is working great but the spindle is a bit warped so there's vibration. Does anyone have suggestions where I can find motor parts (new or rebuilt), rather than purchasing an entirely new motor unit?

Thanks for your help!
~David

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A.O. Smith K48N2N104
2HP, 230V, Max load 10 amps, Single Speed, Round Flange, RPM 3450, Threaded shaft, Frame 56J, Type UAK, Code H