Transfer arm allows transfer measurements from places where it is necessary to move the legs after they have been set to size * Adjusting screw permits close adjustment for fine measurements * Once legs have been set to approximate size and the joint locked, final adjustment is made with a few turns of the knurled adjusting nut * Joint can be quickly and firmly locked by a partial turn of the large knurled disc * Spring washer under the disc maintains proper tension of legs when joint is loosened