You may be right, but for lenses other than 50mm you would have to change the automatic focus adjustment. Which is not all that simple. What plays there too, is that at one quarter going up the column there are two holes about 3cm from each other. You stick a pin in the lower hole when you print with the paper on the baseboard, you use the pin in the upper hole, in combination with an easel like is shown in the picture of this enlarger (this Leitz easel is that 3cm)
I doubt if the Schneider Componon S, with the lever on the side, would fit in the 1C. But over the years I have used different lenses, other than the Focotars, and they worked fine: Nikkor, Rodagon G, Minolta CE and Meogon . . all in 50mm.
One thing you should be aware of is that this early version 1C does not have a filter drawer. Later versions have this drawer which slides from right to left to open, and it is positioned between bulb and condenser. Assuming you will use multigrade filters, you have two options where to place your filters in this 1C: below the lens, or simply on the condenser. Opinions vary which is the better option. Because I do not like to keep opening the lamp house all the time, I prefer under the lens. But others work fine putting the filters on the condenser. Leitz USA made a filter holder for a while which replaces the red filter. Difficult to find. It is not difficult to use an other brand filter holder, I have some made by Beseler that work fine. They do need a slight modification, like drilling a hole and a longer screw. Even I, with two left hands, could do that!
Don't let the above throw you off, the 1C is a fantastic enlarger. Mostly because of the system to press down the negative with the condenser (just one glass to keep clean), the beautiful negative holder which gives a nice black border if you want it and the ease of changing magnification, for which the autofocus was really made . . .