I found mostly pristine series C graflex, except the shutter was stuck together from age, and the lens has peeling black paint on the front inside barrel and a very loose front lens element. Every thing else about the lens is good, with working diaphragm, etc. I'd like to get into the front element group and fix this but haven,t had much success. I'm wondering how the front group, the part in front of the diaphragm disassembles. I can unscrew it from the diaphragm and rear element section. I was thinking of making some jigs to try to see if the barrel comes apart more but it would be useful if I knew how it's put together first. Does anyone have experience with this? I did get the shutter curtain taken care of and it's ready to go otherwise