Terry;
I can see up inside behind the front panel, but do not see the two nuts and lock-washers you mentioned. Even with a flashlight and moving the panel as much as I dare, I just do not see those items. This is after I have already loosened the 1/4" hex head machine screws on the left and right sides of the chassis that hold the black painted cover just behind the front panel. What sort of tool did you use to loosen the nuts and lock-washers you mentioned?
Joe