well there's no Leica that i know of aside from the CL that would show the correct 40mm framelines. These lenses are 'by default' supposed to bring up 50mm framelines on M cameras....however as my mount brings up 35mm framelines, likely due to a loose area of the mount.
I filed my flange (actually the cam that sets the frame line) and it brings up the 35mm frame. It works very well and it took very little filing. Just make certain that the filings do not get into any undesirable places like the glass or moving parts.
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