The new solar cell puts out about twice what the selenium cell did. I've tried partly covering the cell with electrical tape, which gets me within a stop or two after some fiddling. Since then I've read that adding a 100k-ohm resistor will do the trick more accurately.
The CL is a super easy camera to install a diode/resistor in the bottom accessible battery out power line and there is at least one very good YouTube video on it with the most difficulty in keeping the five (5) lower plate screws in order, of different lengths, and the tiny plastic tube-like spacer under the longest screw, between the camera and bottom plate.
That is, IF, that is where you need to place the other resistor.
All bets are off if it goes somewhere between the cell and meter.
That, I haven't a clue about.
Good luck and Cheers to all.