Having to do mine cos i fitted a new rack and mines not straight!!!!

Easier 2 do from underneath thou cos u cant really reach the spline bolt from above.

Easiest way is undo the top bolt and the bottom one and remove the coupling off the spline, then without moving the wheels and making sure their striaght do the top bolt back up onto the column and turn the wheel so its striaght. Then as long as you happy with it loosen the bolt again and fit it back on the spline again trying not to move things and do them all up and should be straight.

Will take a few goes thou i did mine last week thinkin i got it right and its still a bit pissed