The EC-TRACK is designed to have mounts locked into one vertical position during initial installation. To move the mount you will need to remove the payload, use an allen wrench to loosen the set screw, adjust the mount on the track, tighten the set screw with an Allen wrench and put the payload back on the mount. IMPORTANT NOTE: The height adjustable keyboard wall mount for the EC-TRACK 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.