ok, this tip is from the leupold website, (I'll throw in a tip now and then that I found out by doing it many, many times)
if the scope is mounted on a rifle use a small mirror, (if its off the rifle use a big one, such as your bathroom mirror)
hold the mirror against the objective end of the scope (on its lowest power)
look through the eyepiece, you'll see the reticle and a reflection of it.
turn your adjustments until the reflection and the reticle appear as 1, up and down, left and right.
Your scope is now at a true mechanical center.
RR
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Born To Hunt, Forced To Work.
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