hey chris,
those are a pain in the ---! i actually bent the frame on mine trying to get it off. they are a bear. some of the guys on here suggested making a tool out of pipe that will slide over, but the recesses in it and well a long breaker bar to it and spin. i still couldn't get it. a buddy of mine just showed me a way to do it, but it ruins the nut, but saves everything else. he took a grinder/sawall and cut a line through it. just a recess to pop it open. then everything comes loose, including the retaining nut for the sight glass. makes it alot easier. and you can actually reuse the nut because you dont realy see it and it threads back on. just a thought. and i also have a wayne manual that shows every part and where it goes if you want a coppy i will photo copy it and send you one if it will help.
mike