Some customers have reported light leaks coming from the dark slide slot in some Polaroid Backs I made in 2023/early 2024. All backs made since are already incorporating the fix below as a precaution.
Luckily, they are fully fixable, but they do require either I/you install a brass strip to seal the dark slide slot better.
Contact me if your back has light leaks, from the dark slide or otherwise (there are other potential sources).
For this particular case, here’s the help video.