Seems like a lot of hassle Al, just seems like it. Mess it up and then talk about hassle. Good job Enahs.
"This should work" or "I didn't think it would break" has been uttered by people that did not take the task serious enough.
The mill or drill press is a very god one for those objects you cannot hammer or lightly tap on. When breaking loose a seized screw of any size I have NEVER EVER had succes with any type of penetrating fluid, and I have tried countless including the favorites of today. If it is truely stuck due to overtorque or corrosion the penetrating fluid does not penetrate. It does work well after you manage to "break the seal" but not until then, if it did it wasn't really stuck imo, just a little too tight.
Again, good job Enahs. You took it serious and succedded.