moves the component to adjust belt tension application_number US 9454905 A description fig1 depicts an eccentric mounting and assembly system 10 fig4 shows a typical mounting of system 10 to a plate 70 on the engine block 68 wherein the assembly is affixed to plate 70 by bolts passing through the system 39 s rectangular base 18 plate 70 can be spaced from the engine block to allow clearance for electrical or fluid conduits passing from driven a device 56 through base 18 an endless drive belt 74 rotates driven device 56 in conventional fashion besides device 56 system 10 includes an eccentric socket 42 and a housing member 14 returning to fig1 device 56 fits within receiving aperture 48 of socket 42 which preferably is fashioned of a high strength heat resistant non metallic material device 56 is non rotatably seated in socket 42 by the shape of the socket or by alternate means such as axial fixation within the socket by the use of wedges lugs flats or pins for instance at least one lug 62 that extends outwardly from the circular surface of driven device 56 could be slidingly inserted within a conforming slot 50 of the internal wall of the eccentric socket 42 optionally lug 62 and slot 50 can be angled so they effectively have a slightly spiraled or threaded engagement such that rotation force exerted on device 56 by a drive belt screws the device into socket 42 thereby seating the device in the socket with reference to fig1 through 3 the housing member 14 includes a cylindrical portion 16 having an open end 39 with the opposite end of.