My boots split too, they were rally design ones and they sent me replacements.
To split I normally loosen off the nut then put it back on finger tight. Then hit the upright/ joint with a rubber hammer. It seems to work.
My NS Tre is a problem. It spins when undoing so the only way to undo is jack the car on the track rod end. It prob isn't good for it but I can't undo it any other way.
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