USING THE KEYHOLE SAW
To make an inside-out cut, first drill a hole (1)
large enough to admit the point of the saw.
Insert the saw blade (2) and start to cut slowly,
with a minimum of pressure.
Be careful not to twist the blade too sharply, as
the narrow blade will easily bend.
USING THE HACKSAW
Insert the correct blade (1) in the hacksaw frame
(2) and adjust wing nut (3) for proper tension.