I have heated the steering knuckle on occasion which has helped free things up.
I've never been very successful with a pickle fork - don't know why, it just never worked for me. Only use one if you're changing the ball joint because it will tear the hell out of the boot.
Like George said, be real careful, that spring is loaded with potential energy!
As to the hatch strut. I would guess that the term you are looking for regarding the tool name is "screw extractor" also known as an "e-z out".
I also got rid of the locking hatch strut on my '70. I then replaced both sides with struts from a 245. You will find that if you simply add another "single lift" style (ie. '68 - '72) strut to the locking side, the hatch will be very hard to close. That make sense?
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'60 PV544, '68 220, '70 145, '86 745T
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