This information is most useful. I have the 4500 Service manual which specifically mentions lubricating the lead screws. One question I have is when you mention use teflon silicon lubricant on the rails, which component you are talking about. I did not see that in the service manual. Please help me out.Since these scanners are old and the service is next to impossible, it behooves us to keep them in good shape. Thanks once again
Roger