You owe me a beer
I have just got the brand new first series 80mm Componon lens out of its, pristine box and measured it - It fits the Focomat IIc very easily in either side - However, the mounting thread is 25mm diameter, but comes with a flange, so all that is needed is a metal Leica screw thread body cap with a 25mm hole drilled in it to take the lens
Originally Posted by NB23
Absolutely simple, but never done as I am waiting to find such a body cap, so the project has remained unfinished for nearly fourty years - Now for that beer!!!