Driveshafts

[Kaklikian, Gary]

Does anyone know of a source for rebuilt Quattro driveshafts, or even a shop
capable of balancing one? Any BTDT  with replacing the CV's and center
U-joint, in particular on the 4k/5k?  
I know Blaufergnugen sells the CV's and center U-joint, but how involved is
replacement of these parts? Also, why can't I find a driveline speciality
shop that has the equipment to balance the driveshaft assembly? 
A complete rebuilt driveshaft (I assume balanced) is available from the
dealer for $$$.
The Bentley also mentions an alignment tool for adjusting the driveshaft.


TIA,
Gary Kaklikian
86 4ktq
92 S4