As stated previously, if used this method/suggestion is at your own risk.

Leave the jackstand where it is, put another one under the frame rail on the side you are working on, jack up the other side of the car to get closer to level with the jackstand under the frame rail. Remove only the tire on the side you are working on, put a floor jack under the ball joint and lift. If one side of the car is higher than the other the angle will work against you.

Is the problem that distance won't close or the stud resists going into the knuckle? This ball joint stud was in that knuckle correct?

Could you put a chain, a breaker bar or pipe through the center of the spring and through the control arm and spring perch as a safety capture?

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer