Abe Chaber is just over the NY border on Interstate 84 in Danbury CT. Bring this over to him and have him give it a cleaning and lub. Walter Issacson works out of British Sporting in Millbrook. Call Charles and see what they can do. Purdey screws slots are narrow and you do not want to bugger one on a 100 year old gun. They can be costly to duplicate. Good luck.