A vehicular external rearview mirror system comprises a support arm pivotally connected to a base assembly attached to the vehicle. The pivot connection comprises an assembly of rotating plates separated by ball bearings and operated by a powerfold assembly. During normal operation of the mirror system, the ball bearings remained seated in bearing seats to enable the plates to rotate as a single unit when the powerfold assembly is actuated. However, manual folding or unfolding of the mirror system urges the ball bearings out of their bearing seats to travel along a raceway in one of the plates to facilitate the rotation of the plates relative to each other.