This thread is getting furlongs long.
I cannot fathom what you mean.
How many posts does it take to fill The Royal Albert Hall?
I worked in mechanical design back when the government "changed over". The engineer would create his design, in inches. He would then convert his sketches to metric, with tolerances such as plus or minus 0.127. The draftsmen would follow protocol and round them to two places. The blueprint would go to the machinist, who would get out his calculator and red pencil and proceed to convert everything back to the inches that his machinery and available stock used.
Even if there wasn't a calculational error, the parts often wouldn't fit due to the rounding off of the tolerances and dimensions. The end result was more governmental waste of the taxpayer's money.
Who here remembers how we lost a rather expensive Mars probe??
I prefer to measure distance in smoots.
I think I will start measuring things in knots.