Related to this question. I noticed that while tightening the nuts on left/right side of the hub (which, on the left side, hold the cassette), the threaded axle also moves left and right (see schema below).
Question is: is it enough to center it by eye, or should a more sophisticated method be used?
+---- nuts on the other side
< |
<<__ |
<<<| | V <===> (axle moves left/right as nuts are tightened)
-----O<<<| |OOO-----
^ <<<|_| ^------ axle
| << ^
| < |
| ^ +------ hub
| |
nut which was ------+ +------ cassette
loose (the one in the picture)