I'm not a professional oudmaker but it seems to me that you would need to fold a piece of paper in half, trace half the 'beard' on it, cut the paper,
use the paper as the pattern to cut first the insert wood shape, then place the solid wood insert on the soundboard, trace it on the soundboard, cut
the soundboard and insert the wood insert.
To trace it on the paper initially, you can use two circles as I'm showing on the attached. The gray area is the beard.
I hope this makes sense.
Spyros C.
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