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Date: Tue, 09 Mar 2010 21:49:05 -0800
From: Don Wallker <drwalker@gbis.com>
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To: flyrotary@lancaironline.net
Subject: Exhaust flanges
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Jeff,    
Squaring the tubing is easy.  1.5 inch in the center and 1.75 for the 
outer.  Start squishing it down in a vise, slowly, using a strong 
c-clamp on the other sides and work it to the shape you need.

Don Walker