VEHICULAR EXTERIOR MIRROR ASSEMBLY WITH DUAL/NESTED COIL SPRING AT PIVOT JOINT

A vehicular exterior rearview mirror assembly includes a mirror head that includes a mirror reflective element and a mounting base configured for attachment at a side of a vehicle. The mirror head is movable relative to the mounting base between an extended position and a folded position. A pivot assembly includes (i) a pivot post fixed relative to the mounting base, (ii) a housing portion pivotable about the pivot post, and (iii) a biasing element disposed at the pivot post between the housing portion and an end of the pivot post, the biasing element urging a detent interface into engagement. The detent interface moves into engagement to secure the mirror head in the extended or folded position. The biasing element includes first and second coil portions having overlapping and alternating coil patterns.