Hi, I’m new to Key.aero, please be kind!
I have a Controller 35 type 20, I’ve made up a wiring loom and connected it to a Type F (high speed) gearbox from the F24 camera. I want to run this setup for night time photographs taken from a bomber during WW2. 
So far I have made a shutter assembly out of sheet aluminium and perspex, using rubber bands and string instead of capping and shutter blinds and the sprung loaded take up rollers.
So far the capping blind seems to reset too quickly in the sequence. maybe the sequence should be modified, perhaps by modding the controller or some extra hardware in the gearbox?
I have read that there were several types of shutter, and possibly hardware mods made to enable the long exposure. I’m sure the hardware I have is later than the electronic photocell and relay method used early on.
I have a lot of information gleaned from the web, I will try and list the sources in another post, for now I’ll back off and see what sort of response there is!