I am in the process of repairing the door latches in my 1956 Crown. I am also replacing the driver side vent window assembly. I have been told that everything inside the door has to come out. If anyone has detailed instructions on how this is accomplished, please let me know. I have removed the upper interior door garnish and the interior door panel. I have two specific questions on issues I don't know how to handle. 
1. There is a bolt at the bottom of the lower leg of the vent window assembly that I had to apply heat to remove. It is a slotted stud maybe 3/8 inch in diameter and 1-5/8 inches long. It had a nut and washer on the outside of the sheet metal and what appears to be either a threaded washer or undersized washer on the back side of the sheet metal. The threaded or undersized washer will not budge. I assume the slotted stud is used to make adjustments to the vent assembly. Is this bolt an original to the car or is it something installed to get by? Is a new one available?

2. There are two stops along the top of the inside of the door under the door garnish molding that are held in place with two clips. How are these clips removed and reinstalled?