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Guy with the Industar-22 that wouldn't fit on a Leica IIIf here from a few threads back.
If anyone's interested: I managed to fix it. After mutilating half the mount to figure out the problem I discovered the screw threads simply weren't cut deep enough, by just a fraction of a millimeter. A quick pass with a dremel with a fine bit and it screwed on perfectly.
Fucking Russian QC...