Some good info there guys! I always thought that electronic flashes were sealed units. I never realised that the likes of the Stroboflash were open.

I am thinking of trying to locate something that is period correct for my Koni-Omega (this is instead of trying to find and use a Crown/Speed Graphic kit, which will have to wait for another day). Full fowarding to today, what of these vintage flashes would be the easiest to use, mainly in relation to batteries and the like?