Nikon 1 to M42 mount
thingiverse
Nikon 1 mount for M42 mount, tested on Helios 44M-5 and Helios 44M-2 Flange distance calculated with M42 45,46mm and Nikon 1 17mm, the adapter is exactly 28,46mm high so have that in mind for the tolerances, I honestly don't know much about that.
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