Model70Guy,
You got it right when you started thinking about the erector assembly: The turret turning up is actually "dragging" an upside-down image of the reticle down.
Yes, some Euro-scopes have turret screws with left-hand threads. But quite a few don't these days.
Also, quite a few scopes these days have strong enough erector springs that twisting the turret past the desired spot to take out the slack isn't necessary. In fact I haven't collimator-tested a scope in quite a while where the reticle didn't move noticeably (and apparently consistently) with each click the turret (though that doesn't mean each click moves it exactly as much as the manufacturer claims). Personally, anymore I won't put up with a "dialing" scope that doesn't consistently move POI with each click.
Hadn't heard about rubber-tube erector systems.
