How to remove Wiper Arms?

I have a 1987 Toyota Supra Turbo and I'm having trouble getting the arms off. The arms are rusted and I want to remove them to sand them down and paint them.

There is a cap screw on all 3 but after removing these screws the wipers wouldn't come up. Anyone have any ideas?

Thanks

On my 89 there are nuts after pulling off the plastic cover piece on the arm. After you remove the nut, I had to move the arm back and forth until the arm came off. You just have to play with it. The only part that I remember has screws, is where the wiper blade attaches to the arm. For those if you, strip em too badly, drill em or cut them off. I used POR 15 on my arms (gloss black) and it turned out very nice.