I've got a Leupold Mark 4 MR/T scope with illuminated reticle. The knob that controls the illumination feature of the reticle seems like it turns almost too easily. The off position for the control knob doesn't have a detent either. Is everyone else's scope like this? I was thinking that at the very least when in the off position the knob should sort of "lock" into a detent which would make it harder to accidentally bump the control knob and accidentally run down the battery.