HA, HA! Payback time!
Your Harman was the first stoker boiler I ever saw in person, many years ago. A month and a half later, I had a Yellow Flame stoker boiler, then a Losch, then a GJ,,, ect...
Here's a video of how an S-20 stoker progresses from lite-off to full fire.https://youtu.be/yPjFYoUw1CA