I had the same problem in my E.S,went thru the
prop. balance,removed the prop sent it to recommended prop shop it checked out
fine/checked main gear and wheels for any loosness,called cont.rep(engine is
IO550),he flew with me and determened we should pull engine and check for
balance.The only thing i hadnt checked was nose wheel, I did that not thinking
it would be a problem,but when i spun the tire i knew right away it was the
cause.It was spinning in flight and vibrating thru the engine mount.cheep fix. I
know you have a retract gear and might not be the cause but check your wheels
for the proper tightness who knows stranger things have happened. Good
luck
Ken Covington
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