It happens a lot with 700s.
Generally, the fix is this-
Obviously, remove pin, visually verify there isn't part of the pin or similar still in the pin hole...nothing blocking the spring.
Penetrating oil...lots.
Heat it up, not crazy...just to where it is too hot to touch and the oil is smoking. Make sure you also removed the extractor and spring..
Tap it face down.
If nothing, find a punch the diameter of the extractor (not smaller or it will go into the spring). Put it in the extractor hole and tap on it a few gentle raps with a hammer. This will break the spring loose. If you can't find a correct size punch, you can use the extractor but if you deform it at all, you must replace it.
Tap it and it should spring up.
If this fails...you have to get a tiny drill bit and go at it. This is ugly as the last thing you want is a broken spring in there. Last resort...