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To
make this vent use a part of the sprue tree and sand it into
a rectangular shape. Cut this to a length equal to the height
of the No 1 hatch. Round off one end to create the `curl' of
the vent.
Then
sand the opposite lower half to about 1/2 of the thickness of
the sprue rectangle. The result looks like a set of steps. Then
file the larger step to a 45 degree angle. As follows:
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