I am trying to get into the front drum on my 1966 f100 4X4. I have removed the hub assembly and the spindle nut, but am now stuck. There looks to be some sort of bushing or something behind the spindle nut, but I cannot get it, or the drum, to come off. I have tried backing the self adjuster off, as well as hitting the drum with a hammer, and letting the pressure off of the wheel cylinder (and I know that the shoes are retracting, because I have to pump the brakes several times afterwords to get it to reengage). I just cannot figure out what I am missing, my Chiltons book (which should cover this) doesn't even show the piece that is in there, and I have broken 2 8" pullers trying to get the drum off. I do not think the mystery piece is another nut, since it is round and has no discernable means by which to put a wrench to it. Any help would be greatly appreciated. Oh, and, best as I can tell, it's a Dana 30 front end.