Whatever you do, don't adjust the screws shown in that other post. I've asked admin to remove the post as anyone following the advice will almost certainly damage their camera. I'm putting together a post now about the zm rangefinder adjustment which I'll post as soon as I can (it's complicated).
I've put together a post that describes the ZM rangefinder adjustment but, to save me having to format it all again for this forum, you'll have to go and read it over on the rangefinder forum. You can find it here.