Build-your-own mat cutter instructions??

Some years ago I saw (or received) instructions on building a mat cutter similar to a Logan, but at significant savings. Now that I'd like to do so, of course I can't find the info! I know it's probably not worth my time and I should just buy one, but I've got some perfect scrap board to use

How To Cut Your Own Custom Picture Mats - In Pursuit of Chic

You can of course use scissors but a rotary mat and cutter help a

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How to use the mat cutter

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How to use the mat cutter