Once you have the lens assembly out and the screws in the metal plate removed, it will detach fairly easily. As you take it apart, be sure to look for a wavy spacer and the lens to fall out. There has always been marks on my cameras where the spacer has rested against the lens. This will help when you put it back together to know which way the lens goes. But, just in case you forget, there is an upcoming picture that will clearly show the proper lens placement.

Be sure to clean this lens real well because this is what will insure that your pictures turn out clear and without any fogging. 50 year old cameras are notorious for acquiring a coating of dust, dirt and smoke buildup and this is what gives your pictures a ghostly haze to them. Once the lens is free from any dirt, as well as the square glass piece from the front of the camera, you will have a totally clear view for your camera to expose whatever type of film you prefer.