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Message: <blockquote data-quote="shredder2" data-source="post: 8656353" data-attributes="member: 674047">When it's close and I want to extend the port a bit to add a bend, I do something like this...<img src="https://snag.gy/TCLaFg.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />It adds length to the portwall needed... I'll just adjust the external measurements a touch to account for the shrinkage in volume. Then once I re-dimension it (volumes &amp; end corrected port length) and put the #'s in Winisd I'm usually close... if I want it perfect at that point I just resize one dimension until I get the volume/tune desired.</blockquote>

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