Installation Toilet Seat Step : ! Screw Metal Washer: ! Mounting 5 & Assembly Anchor Toilet Seat Hole: E Metal Cmr@ @ = 6. Remove hardware package taped to the toilet seat cover, insert screw and metal washer onto recessed cut-out on the mounting assembly, insert screw with plastic anchor attached into toilet seat hole on toilet and tighten using a fillips screwdriver, place metal cover on top of mounting assembly. 7.