While changing a speaker out I noticed the size of the RCA tip and thought it looked about the same as the flashbulb ports on the brick. It turned out to be exactly the same. stripped some wire dug out my 30 year old solder and iron found a spare hotshoe and voila.
Stealth yellow electrical tape
Now I just have to see if the flash will synch without adjustment. I think it might since Argus advised bulb synch at 1/50 so that should have been the delay for bulb flash.
Argus C3 Flash workaround by
rentavet, on Flickr