14inch, 144roc. 72fl test readings, 1) 0.0000 2) 0.0350 3) 0.1500 4) 0.2330 this is my 6th test, the 4 zone keeps getting a larger no. the last readings were, 1)0.0000 2)0.0220 3)0.0850 4)0.1880 any info on what stroke to use to get this to work, this is all new to me as this is my first mirror. thanks, jep