Solutions
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2ndskoda's post in track rod ends was marked as the answerThe usual way is to use 2 hammers.
Back off the retaining nut (so as to protect the thread) Place one hammer firmly against the eye surrounding the balljoint pin and give a meaningful tap against another side of the eye.
Sound crude - but that is the way most in the trade do it. Frankly the balljoint cracking 'tool' can cause more damage in the wrong hands.