You can eyeball the tubes being parallel by looking at them from the sides with the fairing off pretty easily. If you don't trust your eyeballs, get a piece of glass cut that'll reach across the two fork tubes and is as long as you can fit between the sliders and the stuff under the headlight. Modern glass is extremely flat, so you just press the glass against the fork tubes and check for rocking of the glass. If it rocks, then do some more twisting. Note, forks are almost never perfect, they have to be aligned no matter how perfect the tree. It doesn't have to be perfect. After I got hit by the truck I had to ride the busted bike back to work. The bike handled terribly because the rear wheel was kicked over in the swingarm. Later I found the forks were twisted almost half an inch, didn't affect the steering one bit.
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