 The user can then push the entire adjustment screw and lamp holder up, down, left or right to center the hot spot in the beam.It is this adjustment that most commonly needs to be made with lights that haven't been regularly serviced.Sometimes it may be helpful to use a screwdriver or wrench or other thin tool to reach between the body of the light and the cap to push up on the lamp holder assembly and hold it in place while you tighten the wing nut back down.