The EC-TRACK is designed to have mounts locked into one vertical position during initial installation. To move an arm you will need to remove the payload, use an allen wrench to loosen the set screw, adjust the mount on the track, tighten set screw with allen wrench and put the payload back on the mount. IMPORTANT NOTE: This height-adjustable arm delivers instant movement up and down. In most cases the built in range of the arm eliminates any requirement to reposition the mount on the wall track. For instant vertical height adjustment along a track, review our Leverlift family of products.