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[quote user="Paul_D_North_Jr"]We were confident of that tolerance, and that note was accepted, so "end of problem" as we say. In comparision, with the steel standard you cite, for the length of 43 m the tolerance would still be only 6 mm ~1/4 inch, so both of our tolerances are essentially identical. [/quote] Paul, I have been lucky and found the standard in internet which is very rare. There are too classes. The higher requrements are:  L = Length L < 30 m:                      16 mm 30 m > L > 250 m     0,2 x (L + 50) mm    L in meter L > 250 m                 0,1 x (L + 350) mm At 43 m that would be approximately 19 mm. But stricter tolerance requirements are possible. Regards, Volker
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