The pin is a pressure/expansion pin and should be removed totally. The pin does go through the handle and through the threaded rod. If you cannot drive it out one side turn it over and try driving it out the other side, there may be a slight narrowing. I purchase a punch the same size as the pin from ACE Hardware, the same place I purchased the replacement pressure pin. Try some good penetrating oil like WD40 and leave it soak for a couple hours before trying to drive the pin out. I have 8 Stanley 400 and I have taken them all apart to clean and lube them. Some of the pin are really stubborn, I would be a little bit cautious about drilling them out because you may make the hole to large to be able to secure the new pin that you install.