Vivatar:
Adding an external switch to the Vivatar camera proved simple. Opening the case up reveals that the shutter switch is a surface mount momentary with four solder connections. Now that switch is a DPST - push it part way and it focuses, push it all the way and it snaps the frame. So I turned the camera on and shorted the switch contacts with the blade of a X-Acto knife until I found the right pair.
Probably not the wisest procedure, but it works! Quick and dirty.
Heated the solder iron ; tacked on a pair of leads and a momentary pushbutton off of a junked PC.
Pressed case back together - tested - and victory.
Sweet, sweet victory.
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