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I have seen replacement knobs for the newer 7002 sights but I don't think they are marked any differently.

Something that I just started to use to help them remember which way to turn the knob is the righthand rule. This is a thing that comes from physics to assign a direction to torque and other rotating things. Basically, take your righthand and make a fist with your thumb pointing out. Point your thumb in the direction that you desire the bullet impact to be moved and the direction that your fingers curl dictate the direction the knob is to be turned. There are other ways to remember it but this is the best I have found so far. I always think of a screw pushing the group but most kids don't have a real good sense of which way to turn a screw to make it go the desired direction.
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