What is the best way to perfectly square (tram) your router to you CNC bed?

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What are the best ways folks have found to perfectly square the router to the waste board?

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I used Paw Paw’s method yesterday. Back in January, I squared mine with a construction square. Spent a LOT of time doing it and assumed it was spot on. Boy was I wrong. His way is quick and accurate. I even made a jig for the measuring stick. Here is his method:

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I also bought a metal mm ruler at Lowes to make sure my 880mm front and back were EXACT:

https://www.lowes.com/pd/Swanson-Tool-Company-Straight-Edges-3-ft-Metal-Ruler/1007805