Polaroid cable release adapter
thingiverse
Fits over a Polaroid pack film camera's shutter button ring and allows a standard cable release to screw into it. This allows you to use a standard shutter release with these cameras (i.e. model 100, 101, 102, 210, 250, 350, 440, 450, etc. -- Polaroid 100 series pack film cameras that have a bellows).
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