Hank,
You gotta try it before knocking it. Don't make me do more vids. It is the fastest way to pull them out.
A sawzall is faster for sure, I just think its funny.
When I take out the boss, I have the head bolted down on a mill table, mill out the boss w/an end mill, then I machine the surface for the nut I used.
The head stays bolted down in one position for both operations.
At the time I did this head, I never heard of bolt in lumps, that was 25 years ago.
That is exactly what I need while I recover, more vids to watch.
MBHD