Hello all.....I was trying to check under the compass on my Edson pedestal to lubricate the cables. There are 4 screws under the stainless cover that holds the plastic base on. However I cannot get any of the screws to back out. Used all sorts of screw driver tools and they will not loosen. Have also beeen putting PB Blaster on, however I am not sure it is getting through the washers. The screws have a plastic washer under the head. I was thinking about breaking the washer and then using a lubricating oil to soak the screws.This is a 751/816 model and yes I did check the web site and saw the diagram, however nothing about tough screws....Any advise.....ThanksGreg