On 28/04/2021 12:12, Bob Eager wrote:

Me too. I have a brass plate between the knocker and the bell that says
"PLEASE USE THE BELL". They still don't. The bell can be heard all over
the house, even at the end of the garden. The knocker can't.

I'm still pondering adding a circuit to the knocker so that, if used, a
loud voice intones: "PLEASE USE THE BELL!!".

I like that idea!