Serious suspension problem

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I need to change out the old E.S. bushings that I put in previously for some new ones cause there worn. The problem is is that when I worked on the first lower control arm, I got every bolt off but that one bolt that goes throught the control arm into the cross-member would not come out. It just kept spinning. What do you think can be the problem and what should I do. I ain't trying to swap out no cross-member.