Are you sure the gasket was tucked inside the metal lip everywhere and making good contact? I've had to make 2 or 3 gaskets at times before stopping a leak. If so, check the flange where the glass bowl seats--it may not be flat anymore. I have a warped 1904 that my glass bowl will not seal on, but its own metal bowl will seal if I use the cork material. If it is warped, I don't know if there is anything you can do about it. Maybe someone else can say. The 1904's come up on EBAY sometimes...