Вариант ответа на вопрос "как сделать дырочки?" от Catherine Mehrl Bennett.
"The trick to perforating straight lines with a sewing pattern wheel is to position the sheet on a paper trimmer with an indented trough space under the line that is to be cut. Instead of using the cutting blade, place the pattern wheel in the center of the ruler. The indented trough keeps the wheel in a straight line as you push down, pulling it across the paper. Turn your sheet 90 degrees against the paper guide to perforate the cross lines."
"Pattern wheel perforations are not as immediately visible as traditional perforations are. They don't make that desirable statement that tells everyone “I am a stamp!” So I often print a digital grid of dotted lines and then use the tracing wheel on top of it."
колесико с зубцами это портняжный инструмент, насколько я понял.