I'v never had a problem with this approch. I remove the nuts and either put them back on level with the stud top or find some other ones to use. With the spring full tension, I wack on the nut a few times and the presure pops the tapered shaft out. Only goes 1/4 to 1/2 inch. Will never break and the threads are safe. Put the jack under and remove. Done.
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