I just picked one of these up to experiment doing IR portraits. I found it super difficult to get the film reel to grab the film, but I think I got it working. I tried to use the flash x-sync cable to trigger a cowboy studio radio trigger - it would work, sometimes, at 1/60 a second. I'll have to investigate some more with film not in the camera, perhaps cleaning the flash cable socket will help. I noticed there's a lever that goes between X and MX - I think for electronic flashes you always want it set to X?
Yes, you want the lever set to X for electronic flashes.
Can I recommend artisan obscura soft release for a wooden button
They have lots of different woods in both a stick on button and threaded style to go in a cable release.
I've got a couple and one of there hotshoe covers. Beautiful!!!