Abstract: For use in a milling or like machine, a fixture is provided to hold a part to be machined, the fixture including portions to clamp the part against relative shifting motion. A mount for the fixture includes components movable in tilting and vertical senses whereby a previously machined surface on a held part may be brought into mating contact with a reference surface in the machine thereby locating the part for a succeeding machine operation. A single means is operable to lock the components in a set position of adjustment. The part is firmly held in an unstressed condition for precise performance of the succeeding machine operation thereon.