Can't get a trim cap off my 97 c150 tlrv, was able to remove the other one and replace the seals but now I'm stuck witha cap that does not want to budge. I broke my spanner wrench pin off, tried tapping with a punch and still nothing. I don't care how much damage to the cap occurs or trim rod as I will replace them.

What are some suggestions to get this thing off? Ready to get out the air chisel.