A friend has stairs out of dining room that emerge through a rectagular opening in attic floor. The opening is covered with a piece of plywood backed by insulation board. This "flap" is hinged along one long side, and can be lifted and kept there by hook and eye. The flap appears to weigh about 30 pounds. The lady who owns the house is getting older, and wants to know if I can install an automatic opener/closer for the flap. Do they make such a thing?