Our friend "ThePillenwerfer" has designed a simple transmitter substitute
https://www.vintage-radio.net/forum/...d.php?t=137437
It's on my to-do list of projects.
You may or may not be aware, that if you slacken off the big screws securing the gongs, you will find that by rotating them you can move their distance from the clapper because the "centre" holes are in fact eccentric