Adjusting instrument for an exterior vision unit for a vehicle

An adjusting instrument for an exterior vision unit for a vehicle, comprising:

• a base shaft
• a housing which surrounds the base shaft and which is pivotable around a longitudinal axis of the base shaft in an adjustment range, between at least a park position and a drive position;
• a driving gearwheel comprising a face provided with an outer toothing which surrounds the base shaft, and a gearwheel body, wherein the face defines a face height that is entirely covered by the outer toothing, and wherein a web part of the gearwheel body extends within the face height substantially in a transverse plane with respect to the base shaft, between the base shaft and the face;
• a spring which surrounds the base shaft, the spring being supported on a support surface of the gearwheel body for exerting a spring force on the driving gearwheel along the longitudinal axis,
• wherein the support surface is located recessed in axial direction with respect to the transverse plane in which the web part substantially extends, such that a center of the spring is located within the face height.