Thanks... I can at least partially relate to that already. US toolkits (wrench/spanner, sockets, and the like) have conventionally included both metric and impe

Thanks... I can at least partially relate to that already. US toolkits (wrench/spanner, sockets, and the like) have conventionally included both metric and imperial tools for at least 30-40 years already. (I find myself about evenly using both.)