Here is how to transfer the cam for close focus and place the eyes:
Move to the closest normal focusing position, and then pull the focusing ring away from the base of the lens, moving it over the notch to the other side to enter close focusing mode. On mine it is a bit tight and I almost have to force it over so a little pressure may be involved. At this point, the lens is locked into this position.
There is a ball bearing on the flat portion where the eyes are attached. The eyes depress the bearing which releases the focus cam so you can focus normally. Slide the eyes on and presto the focus will work in close focus mode.