Dave wrote:

And think of the ear ache when your wife sits on the seat. She has to do
it this way every time :-(

Having read this thread from day one, I think the best answer was the
strong magnet and steel plate under the seat.


Well, even better. Replace the magnet with a electromagnet, and then
RFID microchip the wife like the family pet. When she approaches the
lav, the seat WILL be down....

though it may make a hell of a thump in the middle of the night....

--
Adrian C