Measure the dimensions of the windowsill. Make sure to begin with a fairly thin-gauge copper, such as 22.
Mark the measurements on the copper.
Score the copper with a knife or blade.
Bend and break copper to size by hand.
After cutting the copper to size, slide it in the hand brake and pull the bar down to create the bend. Repeat as necessary.
Apply carpenter's glue to the windowsill. Place the copper sill into place and press down.
Nail it into place using copper nails.
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