Has anyone got any good ideas for alternative sources of retaining rings for non standard lenses - i.e. things from the hardware store/mechanics shop or such?
I have an old Voigtlander brassie that I swapped with the Gillimeister. It fits reasonably neatly through the copal 3 hole in a lensboard, but obviously I need something (cheap) to hold it tight? (there also isn't a huge amount of thread...)
so, any ideas?