So my 9 1/2" Dagor, in a very early Compound with the composition iris blades suffered a catastrophic failure of said blades. I decided for now to mount the cells in a shutter that once held one of those Wollensak oscilloscope lenses. (It seemed the least labor intensive way to get shooting)
While I was making the adaptor rings, The Lightbulb went on! I once had a 10 3/4" Dagor, traded it off, and have regretted it ever since. So why not machine an extra ring that will adapt the rear cell of the 9 1/2" to the rear of my 30cm Berlin Dagor? That will give me about 10 3/4".
Schneider did essentially the same with the the post WWII triple convertible Symmars, and I read here that Jim Galli has a similar marriage in a Dagor - type G Claron.
So, I'm a better machinist than optician. Am I missing something here? Any thoughts?