[scooder]

The flywheel didnt vibrate before so we can say it is in balance. I hope.
The runout was also checked and found good before,
You could be on to something with the runout being checked on the crank now fitted, could be the crank flange issue, possibly.
I think a flywheel should be balanced seperate from the clutch cover, this way the clutch can be placed anywhere on the flywheel with no need for indexing, if that makes sence. Thats what I do with rebuilds, and as I said earlyer the clutch dont need indexing, and a replacement clutch can just be bolted on without upseting balance.
Still think it needs tugging and going through.
I know you said no snide remarks about your mechanic, the issue I have is "I thought the vibration is normal"
If I rebuilt a type of engine I havent built before, I do my home work. And if it then vibrated like yours, its pull it apart time (on my coin) and see what I did wrong. Not had to yet, I do my home work.
Martin.
Little knowledge is a dangerous thing.