I have several older LF between the lens shutters (and some on folding cameras) that have bi-post or bayonet (ASA?) type flash sync connectors. Years ago it was easy for me to find the little adapters for those connectors so I could use modern flash units with PC cords. I had a box of different adapters back then, but no longer have them, and don't know where to get more.
I tried all evening yesterday to come up with the right key words to search for them on flea-bay, but all I got was adapters to put on a "cold shoe" in order to use hot shoe flash or to extract a PC connection from a hot shoe to fire auxilliary flash units.
Now, you folks using older cameras and shutters must be getting adapters from some where . . . may I ask where?