Remind your staff to be conscious of squeaks and unusual noises in your chairs, lights and x-ray equipment. If caught early most problems are easy to fix. If they are ignored however you run the risk of needing expensive parts or the prospect of mechanical failure and possible injury to you, your staff, or a patient. Small changes like drifting arms can also signal a pending problem even if a squeak or noise is not present. Most light, x-ray, and unit arms rely on being level for stability. If they are drifting their attachment to the building may be failing. Better safe than sorry.