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Willcox has a great instructional video on installing door hinge spring. Installation tool is a heavy screwdriver with 2” 45 degree bend at end.
Charlie
As long as you're fixing the spring, evaluate the hinge pin bushings for replacement. Open the door to varying degrees and lift on the end of it. Anything more than a smidge of up and down movement will be from worn bushings and/or pin. Also an easy and inexpensive replacement process. If the wear gets excessive in this regard the door will drag on the body at the latch.