I am seeking advice on how to disassemble an Oliver 9 Typewriter (serial number 709425).  I have already removed the carriage, draw cord, mainspring drum, front cover, ribbon spools, keys, and the “shifting platform” that the carriage rides along and which also holds the escapement.  At this point I am uncertain as to the correct procedure to remove the typebars and key levers.  I would greatly appreciate any advice.