I haven't tested the synch; I will do so tonight. I'd be very surprised if I used the wrong socket, but it's possible.

If the synch is off, do I assume it's a big job to fix it? The camera is an old Nikomat Ftn that I cleaned up and converted to use with unperforated film; it takes great pictures outdoors. I think I only paid $5 for it, so it's no big deal.