Abstract: An adjustment device includes an internally threaded tubular body having means for securing the body to a first member. A hollow externally threaded tubular body is mounted in threaded engagement with the internally threaded body for adjusting the spaced relationship of the first member with a second member. The externally threaded body has spherical seats disposed at opposite ends thereof. Mounted in the spherical seats are the complimentary spherical seats of a pair of washers, one washer being mounted at each end of the externally threaded body. An elongated threaded screw is mounted within the externally threaded body and extends through the washers. A head at one end of the elongated screw engages one of the washers while the thread at the other end of the screw engages the second member for securing the washers and externally threaded body and thus the first member to the second member.

Abstract: A bearing and drive mechanism to rotate precisely spacecraft components, in particular, an array of solar panels. A drive shaft in such a mechanism designed for long-life capability is required to have high stiffness in addition to axial and radial constraints for precise rotation relative to a fixed housing. A preloaded pair of duplex, coacting angular contact ball bearings mounted between the shaft and housing provides axial and radial shaft constraint. A single bearing, mounted on an axially compliant diaphragm, is preloaded by resiliently flexing the diaphragm. The preloaded single bearing provides a radial constraint and thus shaft support at the mounting of the single bearing, this additional support increasing the stiffness of the shaft against moments and forces imposed on the shaft.