Abstract: A device for fastening a toilet seat and cover to the rim of a toilet bowl, including a plate having a slot extending laterally across the plate and a screw passing through the slot. The plate is selectively adjustable along the length of the slot with respect to the screw and around the screw for positioning the plate. A stud standing up from the plate receives a hollow sleeve shaped toilet seat support over the stud. The stud is expanded by a tightening screw to secure the stud inside the support and thereby to fix the support.