A quick learner from St. Augustine, FL says:
March 5, 2014
Need to know the order of the parts on the bottom pivot pin -above and below the metal hole. The old pin is so rusted that the nut and pieces below the nut are fused
Paul from SWISCO responded:
March 6, 2014
I recommend using WD-40 to loosen it up. Keep in mind that it may take a few hours, or even a day, for it to be loose enough to come out.