A device at a launcher at an air vehicle for detachably carrying and guiding a missile or the like is shown. The launcher comprises means for detachably carrying the missile and means for guiding the missile in the longitudinal direction of the launcher. The latter comprises a first profile element (2) secured in the launcher and a second profile element (4) secured in the missile, which profile elements are arranged to interact in order to admit a free mutual movement in the longitudinal direction of the launcher, while movement in lateral directions is limited. The device according to the invention is characterized particularly in that it comprises a profile plate (7) and a number of relatively thin shims (8), the profile plate (7) and shims (8) being arranged securable in the first profile element (2) to so limit by means of an appropriate number of shims (8) the mutual movement of the first (2) and the second (4) profile element in the load carrying direction across the longitudinal direction of the launcher that the required allowance between the profile elements (2, 4) for mutual movability of the profile elements in the longitudinal direction of the launcher is maintained.