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<p>[QUOTE=&quot;CatintheAttic, post: 231115, member: 2291&quot;]Thanks for the help so far - all good stuff. I&#039;m doubtful about the photo aperture idea because the quality just doesn&#039;t feel right for a technical photography use, although I wouldn&#039;t rule out the cropping idea. I think more likely some kind of mechanical use - so some kind of guide or gauge. Maybe something will come from practical machinist side. Is it too big for a square nut guide?[/QUOTE]</p><p><br /></p>

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