Abstract: A bridge plate mounted on the top of an x-ray spot filmer has an opening for passing an x-ray beam and several pads adjacent the opening. Each pad has a threaded hole. A ring member which supports an x-ray image intensifier on its top side has a plurality of planar areas on its bottom side which interface with the respective pads. Each planar area is under a recess on the top side of the ring member. When cylindrical washers are placed in the recesses and machine screws are passed through the washers and turned into the threaded holes of the pads, the centers of the spot filmer and the image intensifier and the focal spot of the x-ray tube are established on a common axis. Locators cooperate with the ring member to remember its location.

Abstract: A handle apparatus is for use with a device which has a movable component and a variable speed motor system which is responsive to an error signal for driving the movable component to desired positions corresponding to the error signal. The handle apparatus includes a central stationary support member which can be mounted to the movable component. The support member is adapted to receive a miniature force sensor which includes a linear variable differential transformer having an operative axis. The member receives one force sensor for each axis in which power-assist is desired; with the axis of each force sensor positioned corresponding to each axis of power-assist.