Been there........ taken the whole assembly off and soaked in P.B. Blaster for a week, sometimes Heat or a press works, sometimes nothing works..... and you end up with a broken knuckle. The bolt freezes to the metal bushing inside the knuckle and becomes one solid shaft ! Biggest problem with the T.S.S. is lack of grease on the shaft and bushing and after they stop turning the plastic shims quickly wear out. I grease them every couple years and they stay tight almost forever. And People wonder why the suspension has no give ! ? ! Good luck and b.t.w. I have good used knuckles and bushings.