Sounds simple but this is causing some aggro. I can't release one of the screws which holds the levers in place. It has a domed/pan combined crosshead/flat blade head and has been in place for some seven years. The water around here is quite aggressive and causes a lot of scale so I guess the screw is stuck with this. I don't want to chew up the screw any more than I can help of course. Any tips for releasing it ? This could apply to any tap lever or handle held in place with a similar screw. Thanks. Alan