Flywheel Balancing, Who? Where? How much? Options

[sgomes]

With an electric conversion you don't have a noisy and shakey engine to mask slight vibrations. Before I pulled the car apart for a tranny rebuild I did notice a very slight vibration with the motor spining and the clutch in. It could have been caused by something else I won't go into but my bet is on an unbalanced flywheel. It has very few miles on it so the clutch surface is fine.

So the usual questions:

Who can I send it to? (I'm in the bay area, Cali)
How much can I expect to spend?

[sgomes]

I just read an interesting discussion over on the EVDL (Electric Vehicle Discussion List). The hotrod guys over there were talking about balancing not just the flywheel but the flywheel-pressure plate assembly. Basically they removed the clutch disk, replaced the pressure plate and spun up the motor.

The procedure was to remove one pressure plate mounting bolt and spin it up again to see if the vibration gets worse or better....etc etc.... Eventually they added washers to the appropriate bolts to balance the assembly.

My question is: Has anyone done this here? Is the the "standard" procedure? It would seem that not doing this would kinda negate any balancing of the flywheel.