I prefer standing over the front wheel holding it in my knees and aligning by eye.
Folks blow this out of proportion. Great precision isn't called for. If you can't feel that it's off hen riding, then it's right. BTW- while folks think that a perfectly aligned bar is perfect, the reality is that it probably isn't. Most people have one arm slightly longer than the other, or sometimes a shoulder rolled forward slightly, or some other body asymmetry.
If you wanted a perfect alignment, it would compensate for this, but don't overthink it. If it doesn't feel wrong when you ride than it's right.
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