A powerfold mechanism for an external rear view mirror is disclosed. The mechanism comprises: a powerfold housing mountable between a mirror housing and a vehicle mountable mirror base; a clutch member urged into engagement with the mirror, the clutch member allowing the mirror housing to be manually moved with respect to the mirror base; an electric drive train between the powerfold housing and the clutch member; and a drive stop movably mounted to the powerfold housing and having a drive stop face engagable with a drive stop detent mounted to the mirror base.