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I've got almost four years on you so I am fluent in metric and still pretty good in Imperial, switching between the two as needed. I have some rule-of-thumb conversions which make that relatively easy, especially as my wife for some reason cannot handle metric size measurements. Still, I remember measuring 'something' with a friend while repairing a motorcycle some years ago and the answer was 'six inches plus a centimetre'. It made perfect sense at the time...