Collimation: aiming the secondary

Hi all,
Yes, this is yet another collimation question, sorry.
All of my research states to simply "turn" the secondary until it looks like
a circle through the focuser. Is there a more accurate way of making this
setting? After a few minutes of looking I'm not sure what looks like a
circle and what doesn't.
By turning the secondary holder on the spider, am I pointing the optical
axis at the center of the eyepiece/focuser or is it simply trying to grab
the entire light cone? What I mean is, will the axis be pointing towards
the eyepiece/focuser even if the secondary is turned a tiny bit away? I'm a
fairly experienced collimator but have always wondered about this.
10" f4.7 newt.
I offset towards primary and away from focuser, point the secondary at
center of primary using laser, then I tend to like the barlowed-laser for
aiming the primary.
Thanks all,
-Mac


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