Well I was able to get all but the grease pot and metal plate off this morning, after repeated alternating bouts of Kano oil squirts and punch/rubber hammering; and assume those will come off too in yet more soaking time because they are both wiggle-able at the moment. That takes care of question 1 & 2. Still wonder about question 3 & 4.
Q3: I am missing the long spring that stretches across the horizontal arm just under the top cover. What is it's purpose? Or is that only a part for the 306 models?
Q4: The motor carbon brushes are exactly 1/4 inch tall, should I replace them with new ones? If so where do you all purchase them from?
Any advice is appreciated!