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All blades have the same size, 36cm long, aerodynamically well shaped. But. The first weighs 120g, the second 125g… And the third one 210g… This is a small problem. So what are my options now? Making a new blade would be the last option, but do I have any other options?
I don't believe that the reason for this is density changes of the wood but more likely imprecise dimensions. I can't really tell from the picture, but the lower blade seems slightly larger or maybe even thicker.
For example, the section marked in green at the heavy blade seems to be bigger than the blue marked section of the light blade. So I would suggest sand paper.
Could be. I'll try a mix of grinding and hollowing probably.