Disclosed are various embodiments for providing managed security credentials to network sites for authentication. A fender portion of a vehicle at least partially covers the interface, protecting the interface from environmental conditions. The retraction mechanism includes a reversing member for generating a reversing force when compressed by the pressure receiving portion and the pressing portion. Deficiencies in representing likelihood as related to nonlinearities and heterogeneous precision are compensated by essential weighting of respectively mapped path-oriented displacements. Other embodiments are described and claimed.