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Unfortunately a perfectly accurate scale/gauge combination means dead scale clearances , working tolerances etc etc. Try scaling down prototype clearances to 1/43rd of the real value and you'll be in trouble, fast.....

A degree of compromise is necessary on practical grounds unless you are a very skilled precision craftsman

I think gauge 1 has used 2 different scales with 45mm gauge and there are adherents of each....

It's always been "so many mil to the foot", as a convenient way of resizing dimensions , tthough there are a few cases where the "so many" is imperial. For example 1/72 scale for plastic aircraft kits started as 1/6" = 1 foot. But measuring /calculating in 1/6ths of an inch is a lot less convenient than counting off mm
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