I am thinking about replacing the rear brakes on my 2004 Mercury Sable. They do not look very complicated. The problem I am having is the drums will not come off. I know that there is an access hole for the rear adjusters. I have the tool for the rear adjuster (spoon tool) but cannot seem to find the adjuster through the access hole. Is it better to use the access hole or hammer the drum? I understand that drums form a lip which is why the drum won't come off easily. Any advice is greatly appreciated.