Simple question for those that have a scope like this.

When you do your side focus adjustment for the first time, and need to relocate the knob to properly match "infinity" with the hash mark on the scope...

I take the set screw loose on the knob, and am able to pop the knob outward about 1/8''. Here is where I'm not sure. The book says diddly squat that came with the scope at this point, in fact it says nothing about re-aligning the knob at all. When I then rotate the knob to realign the marks, it still feels like I'm moving the paralax mechanism just as if the knob were pushed all the way like normal.

So is there a friction inducer of some kind, that acts on the knob no matter if its pushed in or not? Or am I still indeed moving the paralax mechanism when I don't want to?