This is a doorstop for a door with a 1 3/4" dome backstop. Put the doorstop over the backstop, and the tongue catches the door when you open it. Push down on the tongue with your toe to close the door. This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/6rbjBnHm0kYI made these out of ABS filament with 2 or 3 shells. I suggest vapor polishing before use to improve the elasticity of the flexure. If your door has too big a gap, you can put a couple of rubber feet under edge nearest the flexure, or heat bend the flexure gently with a hot air gun.