Donald Qualls
Subscriber
Hmm. Looks like the Cludor was designed with internal sync, while the Vebur needed it added (either at the factory during manufacture, or aftermarket) as did the Compur-Rapid. Still seems odd that it would be X with that trigger, but I'll try to turn up one of my strobe adapters (hot shoe adapter with a PC cord) or a strobe with a cord built in, or the plug-in sync cord for the one strobe I have out, so I can test the shutter. If you see the shutter fully open with a strobe, it's X; if not, it's M (or in need of repair). You can also use the strobe to observe the position of the cocking lever when the flash fires to confirm.