New to this thread, but since a friend has asked me to help him build one of these, i figured I'd check in. I previously asked what the two round items were in a photo of a bunch of parts that was posted by Sym-Cha I beleive. I have since found out they are vintage camera lens parts and very hard to come by. Does anyone ( Sym-Cha or Kroenen perhaps) here have any super high rez pics of these from a bunch of different angles? Also, what is the diameter? I think I can do a pretty good representation of these in 3D and get them 3d Printed. Happy to make the file available if I can get enough reference pics.