Thank you a lot.
After my measurement I ended up to the conclusion that difference between B67 and B77 fixation thread is 2,11 mm ~ 2,1 mm. I mean center point of the fixation points is 2,1 mm different. B67 has M4 screw and B77 has M3 screw. So if I make a new hole to this base plate of head...
I’m in progress of fitting B77 4-track head to my Studer B67. There is almost no information for doing it. This is already 12 years old post but only piece of info for doing it I have found so far.
If you are still online and have that unit or if somebody else knows about that. I would like to...