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I'm not smart enough to do trig either, but my calculator is. Spreadsheets work fine and are convenient, though, as long as they have the correct formula. Any popular spreadsheet should be correct.

Exactly so. I thought I was more clear on that.

What ever seems to work for you or whatever you prefer. I seldom actually measure at all, TBH, but when I do, I go ahead and calculate correctly. It isn't complicated. Still taking only two...

That's a good rule of thumb for selecting steel dimensions for a stock removal razor. Remember though, that the actual bevel angle is not directly determined by total blade width. The spine does not...

Just pick one spot and measure. Just for fun, pick another spot and measure there. And another. It might amaze you to find that the bevel angle is very close to the same along most of the blade. If...