OK, after two year of thinking this was a impossible to find "Unicorn" I now have a brand new one. I'll use this thread I started two years ago to post some info on it to make the info available to others. I'll get some photos up soon, but first is the instructions were in german, and not english. this is a touch more complicated that I originally thought. I've attached a PDF scan of the two page instructions. Below is the english translation using google translate:
Operating Instructions for Back Adapter
Linhof / Bronica 001685
- Turn the transport wheel (1) until the hole (2) is visible. Insert the enclosed pin (3).
- Unscrew the transport wheel (1) counterclockwise and replace it with the enclosed transport wheel (4).
- First, hook the cassette into the two retaining plates (5), then press it down. It locks automatically.
- Unlocking and removing the cassette by pressing the button (6) is only possible when the cassette slide is inserted.
Film Advance with Adapter
Insert the film as usual and, with the cassette closed, turn the film advance knob (4) clockwise until the number 1 is visible in the window (7). The film advance will automatically stop. Press the lock button (8) before advancing.
Reviewing the instructions and the parts provided, replacing the Bronica wind knob with the Linhof one is not something you will change mid roll as it requires opening up the back. Turning the knob will as-is will work for me since the kit only provided once replacement knob and I have 4 GS backs. I might look at possibly 3d printing a larger knob, but for now I won't install the knob on any of the backs to see if the Bronica knob will be ok for general use.
Another thing not mentioned in the instructions is an additional piece. It is clearly a spacer meant to go where a film holder normally goes, under the ground glass. Unsurprisingly the mount doesn't place the film at the same plane as the ground glass so this piece pushes the glass back a couple millimeters to match. At least that is what I assume, since there are no instruction on using that piece. I expect I will be able to run a roll through this weekend. I'll make sure that one or two of the shots are focus tests.
One small issue I already discovered is that it doesn't fit the TK23S (and presumably the earlier TK23) in landscape orientation because of where they placed the button to release the Bronica filmholder from the back. To do landscape, you need to mount it upside down. Not difficult just slightly unexpected. I'll post of aphoto of this when I get a chance. My cell camera is dead at the moment so I'll dig up a camera to take pictures of the parts, but it might take a few days.
