There is some play in the blades, as in they slide into slots in the hub but are not secured by bolts or anything. But I'm not aware of a design feature where they would slide inward to increase clearance. I would think the opposite would be true, in that centrifugal force would cause them to move outward during rotation. You would also have to account for the force imparted by the airflow and thrust production, but that would mostly be fore/aft. I too have seen some rubbing on the cowl interior which is normal.