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I don't have a problem working between imperial and metric and neither do most of the people I know. It's only hard if you make it hard. If it's a woodworking project it couldn't be that precise so just use 25mm = 1 inch. You'll be less than 2% larger. If a car has both types of fasteners look at the head of the bolt and if it has a number like "8.8" then it's metric. If it has radial lines it's imperial. Wrenches/sockets are pretty interchangeable between 5/16-8mm, 1/2"-13mm, 3/4"-19mm and 15/16"-24mm.
Come to think of it, the US military won every war they fought in with the imperial system and pretty much lost everything they fought in with the metric system.
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