Step 16Make the Inner Riser
Cut out the measured riser with your scissors (you can use the craft knife, but this is faster)(Photos 1-2). Use the ruler and the dull side of the craft knife to score the flaps of the riser on one side similar to the process in Step 6 (Photo 3). Fold the riser into shape along the scored edges (Photo 4). Test the fit of your riser (Photo 5). If it doesn't fit you'll need to move in your folds another eighth of an inch all around. I've never had one not fit though.
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