Hello,
I'm a proud new owner of a slightly troubled Mamiya Press lens. The problem at the outset is inability to reach infinity on the focusing scale. It stops just slightly before. I have opened the lens and discovered a sizable nick near the end of the helicoid which prevents the thread on the front element from reaching the end of the helicoid.
I wonder how this kind of damage could have even come about, if it is damage. Or maybe it is a kind of stopper, i.e. intended feature. Somebody must have seen this lens before and can tell how it is.
I could thread the front element to the helicoid from a slightly different starting point and reach infinity on the scale, but then on the minimum focus distance the front element loses its coupling to the mechanism.
Added complication is that I don't have a 'proper' camera for this lens to be able to see if the lens currently can reach infinity focus or not. The lens is destined for adapting to Instax Wide 300 camera.