It has been seen but I would say it is rare on 12's that have the brace installed.
If your blade pitch is close, start looking at other things that could induce airframe vibration. ( confirm a good carb synch, have a dynamic prop balance done)
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Any opinions expressed in this message are my own and not necessarily those of my employer.
Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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