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Marv,
 I used tin snips (shears?). These are the ones with a long handle (10 inches)
and 3 inch blades.  I then used a file to smooth the edges.  I also used a
tool (used to finish lightening holes) to put a 1/4 inch beveled edge around
the firewall.  This tool is about $12 from Aircraft Spruce and consists of two
closely spaced rollers on a handle allowing it to be run along the edge of the
material so the bevel can be formed.  The benefit is to stiffen the firewall
material to prevent near-edge oil-canning and provide a way to hide the fiber-
frax edge.

Scott Krueger
N92EX