Yep, I too have numerous times used the heat treat method to loosen up a glow engine. Then as you say, oil it, a shot of carb cleaner spray through the fuel inlet with the throttle open, then hook it all up and fire it!

My personal glow engines that were carefully run dry then oiled with ATF don't tend to lock up; even after years of storage. I have an old Fox .78 that I bought around 1981. It has never been apart yet runs perfectly. It's actually one of my favorites in my glow engine collection because it runs so nice. It starts so easy I've never used a starter on it. It has at times sat for years, then takes off and runs like a charm!

AV8TOR