Originally Posted by Richard G
I would like to clean the back of the front element of my Leica II's 11 o'clock Nickel Elmar but I can't find any detailed instructions on how to remove it. There is a featureless brass ring which seems to hold it in place. Without the perfect tool for attempting to rotate that I am sure I am better not touching it.
Look for a rubber stopper with the same diameter if the brass retaining ring on the front has no holes or notches in it.
If this doesn't work have the lens cleaned by a competent repairman.