Install the compensating union with the mounting bolts  loose and insert the aligment tool  through the fitting on the top of the coolant union to align it with the motor shaft.
NOTE: The T-tool may not fit in the bore anymore, to align the union you will need to float it in.
Turn the motor by hand to make sure the shaft is not rubbing as you tighten the union bolts.
If the T-tool does not fully insert rotate the motor by hand while with the other hand feel if the union is rubbing with the shaft.
If no rubbing is present torque the bolts to 12 ft-lbs (16 Nm)
Remove the alignment tool.
Run the spindle motor at 100 RPM and slowly ramp up speed to verify the union is not rubbing on the shaft.