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hight gauges , or set up bars . I will use the half inch bar,
and the three eights inch bar.

with board on its edge ,I use the 1/2 inch bar and draw
a line .

I flip the board 180 degrees and repeat

I lay the board flat and use the 3/8 " bar to draw
a line in the same manner to divide it into halves .
Elapsed time is 3 to 5 seconds ….with eyes closed.

Not such a simple puzzle .