That is a very well thought out reply SMB1. I really enjoyed it. Perhaps we could start a separate forum "The thinking man's guide to Storage and Material Handling". I have sold and operated in the UK and USA and over here emotion and relationships drive decisions a lot more than logic. Result is a lot of installations that should never have been put in and will never work. However because Mr. Big chose it, he will never admit it is a failure. The warehouse people struggle on until replacement time.