All you guys.....
Thanks for the advice. The washer I referred to was an integral part of the bolt. The bolt is either welded or stuck to a square piece that fits inside the clamp. Even after lifting the "flaps" on the sides, the washer is not designed to turn. No amount of prying could get it to move, and the two ends of the clamp fit over each other, and wrap around the square piece UNDER the integral washer.
Now that it's apart, the bolt is still affixed to that square piece.
It's off. Let's just leave it at that.
Goes to the painter next week.