1.Remove old seat. Use oil on old hinge nuts if needed
2.Insert threaded bolts through top mount hinges. Attach washers with flat side up to threaded bolts.
3.Place new seat on bowl and insert bolts into pre-drilled holes in bowl.
4.From underneath bowl, place threaded bolts.
5.Hold nuts with hand and tighten each bolt with screwdriver until seat is secure. Do not over tighten bolts as this could crack the bowl.
6. Close and lock the hinge in place.
7. Periodic checking and re-tightening of the nuts is recommended.