That is the way i would act indeed Craig; just bring the flywheel/presure plate combination to a good balancing firm and everything will be ok.
My car had some vibrations before we had to exchange the clutch.
The dealer was certain that he could get rid of the vibrations by just doing his very best, balancing the new clutch/flywheel.
With no succes however. (still; there wás some unbalance in the new mounted parts, wich he minimized beyond factory specs)
Vibrations and Maserati.....
When i had the 3200GTA, i bothered very much to get rid of torquetube vibrations.
After visiting a dealer, who tried to balance the tube under the car with the help of the SD2 tester, i decided to buy a computer balancing system myself, wich i currently use to balance tubes on a self made bench.
The SD2 tester is not fit for this kind of work in my opinion.
On top of that, the mechanic did not want to listen, when i sayd that a real good, clean measurement, could only be obtained with both the halfshafts OFF the differential.
During the measurement influences of the brakes/handbreak could be felt and they ruined every next attempt.
i later succesfully did the job at the car with my own equipment and the halfshafts off.
Gathering quite some experiences balancing rotating parts at a car and now on the bench, i must say that i am stunned to see what a mass of 5 gramm can do to to the wellbeing of the linked parts.
As you can see in the picture, i balanced a tube complete with its differential.
Even linked to the quite heavy differential, the influence of 5 gramm unbalance at the tube, can be felt at the diff very well!
Therefore i can not understand why a professional would balance a rotating part, by observing and interpreting a vibrating door....
On the other hand, torquetube vibrations (where allmost every 4200 suffers from) is way more noticable then a tiny bit of unbalance at engine side.
That torque tube...that is the real culprit of the 4200 and cause of the still occuring 2900rpm vibration in my car.
To be honest; i drive the car very often with low rpms high gear.
Only in those circumstances the vibration comes forward.
When the car is used where it is intended for, you will not notice these vibrations.
The dealer states that these virbrations are part of these cars concept and absolutely normal.
Maybe so, but i hate it.