Joe,
were you running the engine during the balancing and if so did it feel better?  meaning the vibration is gone.  you state that he only checked it at 2000 rpm.  have you reduced power to that value to see if it goes away inflight?
does the vibration only seem to happen at certian rpm settings or does it vary with airspeed?  it could be an airframe thing.

in any case I recommend taking it back and explaining the problem.  offer to take him up for a demo.  if the prop/engine is truly balanced it will be balanced on the ground and in the air.  I have had airplanes come in for prop balance only to realize when running the engine that its not a prop balance issue but an ignition issue.  a faulty / weak spark plug and bad wires will cause a vibration as well as a mag or mag timing issue.
mark

Joe
I just went through prop vibration pain Dynamic balanced it yet but the source was from three separate sources and all would show there own unique vibration at different power settings . First I sent the prop in to be checked it was according to manufactures specs , After being reassembled the prop was dialed and deturmend to be slightly out , and was corrected by replacing the Spacer. This was a great improvement but did not completely eliminate the problem ,Next the spinner was turned 180,again an improvement but still some vibration at high power settings, lastly the forward Bulk Head was looked at and replaced that managed to get it all of it.
Now I'm going to have it Dynamic balancing.

Good Luck
Dave

How much vibration is consided normal? Is it possible to have no vibration ? I have not flown another airplane in two years since I bought mine so how do you compare ?
I have flown rentals years ago that were like flying wash machines.

I read an article in one of the aviation mags about a brand new prop causing a vibration that couldn't be tracked down.The author found it to be that it was just a different set of vibrations than the old prop.Not worse,just different.The prop's manufacturer,Hartzell,even had the owner come to their facility for a dynamic balance with no change.They flew the airplane,and after landing,asked the owner if he had ever flown behind a new propeller.No he hadn't.This turned out to be the answer.The power pulses from the engine were being transfered to the airframe more efficiently than before,hence the new vibration.

Oh well,it made sense to me anyways.