Good suggestions so far, but here are the problems: 1) the bolt turns, so it is either stuck in the sleeve on the 'isolating tabs' (for lack of a better description)in the id of the sleeve; 2)the bolt is frozen/rusted to the sleeve and is turning inside the bushing; 3) no access to the head of the bolt for grinding or cutoff purposes - only the access hole for a socket; 4) body end of control arm is completely boxed in, with exposure at the attachment point only to the bottom side of the arm - applying heat would eventually burn out the bushing, but the sleeve would still isolated by the arm itself. I'm not sure if there is enough room to operate a sawz-all inside the 'attachment cavity', to cut the bolt, but that may be my next attempt, unless somebody has another idea.