Quote Originally Posted by DWThomas View Post
The currently manufactured Gossen Digisix has a threaded insert in the bottom and there is an optional shoe mount adapter (which costs about twice what it should) available.
Just get a flash socket, flash adapter or whatever of that kind you can grab at a fleamarket ar alike, and mount the socket proper by screwing or glueing to that Digisix.

The historic mount-on ones I can remember were selenium ones. But there are some sites on the net devoted to historic exposure meters, maybe you find there something apt to look for then.