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Old 05-21-2020, 03:25 PM
  #5  
Tartan
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Join Date: Mar 2011
Location: Ontario, Canada
Posts: 41,610
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I would clamp the metal ruler or straight edge to the mat so the utility knife will cut down in the same place each time. You could start it with a sharp rotary cutter but it will only cut down to about 1/4 inch I think.
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