Shackle bolt seized
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Six point impact socket. The problem is, the bolt rusts to the steel sleeve in the bushing, and they become one. Since the sleeve is pretty much trapped between the mount ears, that means the sleeve won't spin. At all. Try alternating the direction you are trying to turn the bolt with the impact. Also might try some better chemicals. (pb blaster is my go-to for that....) Need to get it between the bolt, and sleeve though, which is going to be difficult, at best...... and likely simply impossible.