An apparatus (102) comprises a mechanical interface configured to mechanically receive a module (101) into an assembled configuration. Within said mechanical interface, the apparatus comprises a first connector configured to receive a first matching counterpart in a first insertion direction (103), and a second connector configured to receive a second matching counterpart in a second insertion direction (104), which second insertion direction is the direction of a curvilinear motion and different from said first insertion direction (103). The apparatus (102) comprises a hinge joint between said first connector and a body of the apparatus. The hinge joint has an axis of rotation, which is essentially perpendicular against said second insertion direction (104).