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This is a make shift bending brake consisting of the peice of steel you see across the top as well as a peice that just fits inside the bend. After being clamped together, a rubber mallet was used to to make the bend. The louvers and bolt dimples you see in this picture were pressed in prior to making the bends.
A peice of .120 wall steel tubing was chucked in the lathe, and internal threads as well as a relief on the outer end for an o-ring were machined.
In the 3rd photo, the tube is being used as the thread guage when machining the filler cap.
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