An apparatus (100, 400) configured for precision adjustment includes a support fitting (115a-115c, 415) having a void (118a-118b, 418) oriented along a first axis. The apparatus also includes an adjustment screw (120) disposed within the void. The apparatus further includes first and second set screws (130, 130a-130d) coupled to the support fitting, where each set screw has a substantially conical tip. The first and second set screws are oriented such that a plane bisecting the first and second set screws is substantially perpendicular to the first axis. An edge of the conical tip of the first set screw is substantially parallel to an edge of the conical tip of the second set screw.