Thanks for the replies and advice.
I was able to remove the throttle valve, soak it in
PB Blaster, heat it up in the oven, fuss with it and
got it to budge just a smidge. I knew I had it. A
bit more careful fussing, back and forth, and it came
free. Of course, I put it back and tested the engine
on air and it ran, smooth as silk, in a heartbeat.
It even runs on my 69 year-old breath power.
I'm ordering a steamdome with weighted S/V and a filler
plug from Germany. Worth every penny for an engine that runs.
For fun, and a first steamup, I will be using an S/V from a
Bing engine. Video soon.
Wayne