Kenneth wrote:

"Ladies and Gentlemen... We have a winner...!" (with
honorable mention to Tnom)

I did not have any beeswax handy, but did have some candle
wax.

Before describing my experience, I will admit that I thought
it unlikely that either technique would work because it
seemed to me that the melted wax would be far too viscous to
penetrate, and I had no luck with (what I thought were
"proper" penetrants.)

So, this morning, with a candle in hand, I approached the
beast, lit my torch, heated the yoke slightly, and dabbed on
the wax, both in front of, and behind the yoke.

I then intended to hammer the yoke back on, but because of
the odd shape have to be very cautious to locate the blows
properly. The first few stroked were very light taps rather
than the firm strikes I expected to need.

Tap tap tap and the damn thing move... visibly.

Next, I grabbed my prybar and the spacer that allowed it to
work. I expected to have to lean into it as I had, but as I
got it into position just its weight and its wedging action
moved the thing slightly.

I gave a pull, and it moved about 3/4"... Another pull, and
it was in my hand.

I was truly astounded, and most appreciative.

I've been around tools for fifty years, and had not heard of
this wax trick before.

Sincere thanks for all the help,

And special kudos to you for being willing to try something a little odd.

Many would dismiss the idea as "can't possibly work" or "go away, loon."