A flat rectangular platform 250*40*250 with a hole in the center with a diameter of 75, above it is a ring with an inner diameter of 75 and a thickness of 10. The ring is parallel to the platform. From each corner of the lower platform, supports in the form of parallelepipeds with a width of 10 are attached to the ring, the attachment points of the parallelepipeds to the ring are equidistant and located at the bottom of the ring. The distance between the platform and the ring is 350.