If you are really good with small amperage arc welding,
you can spot weld a small arc rod to the pin, and use it
as leverage.
The heat from the arc relaxes a some of the tension, and
helps the removal.
I used that famous duct tape with a small hole in it to
shield the other parts from arc spatter.
I did this twice successfuly, not sure of how well it
might work here.
Archie

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