Hm. that's a good one, math was never my strong side or Imperial measurements for that matter. What I simply did was to use the Metric bearing tool and scaled it until it hit with the ruler on the marking showing the for e.g. 800 on the marking and also measuring that with the ruler. It is simply a visual guide and I guess if some one would like to recalc and re size it be my guest. As I said before this work is not originally mine. I simply wanted it for myself and thought ppl might also enjoy it. So I simply converted it, no more no less. To make it perfect I guess one would have to make a new tool graphically and that's a bit of work in Adobe Illustrator or something.
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