Hi, 

You left out of your story the time when the vibration began.  Was it
always 
there or did it begin after something else happened.

There is some disagreement as to whether there might be a range of rpm
which 
cannot be allowed because of vibration problems.  I have seen one note
which 
limits the engines to use outside 1950 - 2100 with some prop combination 
while another combination had no limitations.

You might also try changing the prop indexing to some other position.  The

usual position is chosen for hand propping purposes which does not
guarantee 
the best vibration combination.

Let us know when this all began.

Bob Condon
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