How to interpret the ruler in manipulator, pushpull.
Sometimes when using the manipulator or pushpull, I get it to do the opposite direction of what I intended. For a while, I thought that moving the component past where it is in a given direction allowed one to enter a positive value for distance in that direction, but that doesn't work reliably. Then I though that possibly the coordinate system determined the positive and negative direction but that isn't reliable either.
So, what's the secret to specifying a direction?