Abstract: A device for installing rocket engines supported at a cant relative to vertical, an axially extensible, tiltable pedestal, a lifting platform for supporting a rocket engine at its thrust chamber exit, including a mount having a concentric base characterized by a concave bearing surface, a plurality of uniformly spaced legs extended radially from the base, and an annular receiver coaxially aligned with the base and affixed to the distal ends of said legs for receiving the thrust chamber exit. The lifting platform rests on a seat concentrically related to the pedestal and affixed to an extended end portion thereof having a convex bearing surface mated in sliding engagement with the concave bearing surface of the annular base for accommodating a rocking motion of the platform about an axis angularly related to the longitudinal axis of the pedestal, whereby excessive asymmetric loading on the thrust chamber is avoided.