I just lost a bushing in the wiper assembly. Just crumbled into pieces. By marking the location of the wiper arm in relation to the knurled stud saves some trial and error in re-assembly. When removing the wiper arm, if you first lift it (spring loaded) and hold it, you may then rotate the lock which has a tab projecting at the top. If you don't lift the arm, damage could result in the wiper arm assembly. By the way, there are four bushings in total. Replace them all. (As stated in the past by other members.)
I don't know already posted but Schumacher Creative Services in Seattle has wiper pivot seal kit, seals, base gasket and installation instructions for 11.50 plus shipping. No more wet feet and ruined carpet they say.