Cutter's thread on shop floor talk won't tell you anything about how to disassemble it. Remove the screw first by removing the 3 screws on the front. When removed you can take a dowel rod and punch out the back cap. Then use a pin punch and tap them into the vise. With the rear cap removed you get a good view of it.
Then degrease, clean, paint, regrease, and assemble. I've tore down two Wilton's and their easy after one time. I will admit when I did my first I thought I was going to damage something tapping the pins in.