Ok, so I took out the takeup to replace the driver. In the process of getting the old driver out, I of course opened the whole thing and dropped the pins and springs from within the clutch. ::sigh::
So I am a locksmith and small springs are not hard to find for me. However, these pins are smaller than ones I use in locks, so if I can't find the 3rd one, I will have to mfg one. I do so hate to make parts that small but whatever, gotta do what you gotta do right?
I have already build the driver for the takeup, not too hard started with a piece of a brass keyblank. Once I get this all back together, I will work on getting the shutter out and ACL'ed. This is exciting, if the upgrade is this easy, then there will be a lot of very inexpensive very usable 120 cameras around.