Manual doesn't say not to, but I never have AA batteries in the unit if I'm running the USB pack... I just keep a set in the bag just in case something were to happen to the USB in the middle of a shooting session.
I never tried the straw aiming... speed square always worked for me. If I were to, I'd take a small needle file and smooth down the panel lines inside the v-notch so the straw nestle down in there nice and flush without rocking around.
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