Sawzall the entire mess out and deposit in a scrap bin. Buy new kit, round house arm/carrier, grease, install, get back on HQ and thank N2O for the best advice.
I’ve always had succes driving the most bitch stubborn seized up pivot bolts out with an air chisel. Lube up the bolt and set the chisel in the center hole of the pivot bolt and drive that fucker out. The percussion of the pneumatic chisel is what’s going to drive the bolt out.
I second this.
also looks like you mushroomed the bolt end any ways you will have to get a new one
be sure to lube that baby up nxt time you slide it it, a lot of people will drill small holes in the bolt and then fit a zerk in the end to lube it.