The bolt is stuck in the steel sleeve of the rear mounting bushing (?), and I cannot get it out. I've soaked it in penetrant, tried hammering it out, and the bushing came loose and is now just spinning inside of the case. What's the best way to go about removing this? I was thinking about using a chisel bit on an air hammer to cut the sleeve or bolt. Sidenote, my dad tried using a mini sledge on the bolt but just ended up forcing the bushing out and cracking and bending the mounting point on the frame rail.