Chris,
Gumbi has it correct. After removing the retaining pin, the manual probably says to remove the grease fitting (zerk) on the big pin (bracket pin in the diagrams) and screw in a fitting that goes on a slide hammer. It worked on my 1950 COE but you can also tap it out with a punch from inside the frame, assuming there is a hole there. One piece of advice the spring shop shared with me was, take the weight of the spring off the mounting bracket with a floor jack before trying to budge the bracket pin. If it is still hard to budge, consider trying to grease it well with the zerk in place or use penetrating lubricant.
Kent
