I feel I should share this -- it's an explanation provided in the Leigh dovetail jig manual for why two things share the same scale. Leigh's based in Canada, w

I feel I should share this -- it's an explanation provided in the Leigh dovetail jig manual for why two things share the same scale. Leigh's based in Canada, which appears to be nominally metric, but I gather most of their market is the other part of North America (which obviously isn't). I bought the metric version of this jig - and I'm ecstatic they make this. The metric measurements are just different scales & translations - they didn't redesign the device at all. Decimals don't slow me down, but comparing fractions with different denominators does. Most of the manual they mention metric values in parenthesis, but in some sections it seems the authors just, understandably, gave up. I'm perversely envious of people who can effortlessly make sense of this: """ Section 8-23 : Why are the 1⁄2" and 11⁄16" [12,7 & 17,5mm] pin widths on the same scale line? 1⁄2" through dovetails are routed using a 7⁄16" guidebush. 11⁄16" through dovetails are routed with a 5⁄8" guidebush. That's a 3⁄16" difference in size between the two bits ... and between the two guidebushes. The 5⁄8" diameter guidebush for 11⁄16" joints requires that the guide fingers be opened up by 3⁄16". This automatically makes the pins 3⁄16" wider but on the same scale setting. """ (From https://leightools.com/wp-content/uploads/2018/04/D4R-Pro-User-Guide-Complete.pdf https://leightools.com/wp-content/uploads/2018/04/D4R-Pro-Us... )