Rebuiding midrangers on Thiels

Send them to Thiel. The Thiel drivers though appearing to be stock items are actually modified to Thiels specs. The midrange drivers for the 3.5's are a bit unusual in that they use paper surrounds. Though out of warranty, Thiel is rightly famous for their customer service, and typically pretty generous with regard to such repairs so long as the drivers weren't abused.

Rrog, without going into the details, let me just say that I've had my 3.5 midranges and some other Thiel drivers repaired by Thiel for a much more modest sum.
Though we haven't met, I've heard nothing but excellent reports about Bill of Millersound from people who deal with him often, I'm just outside of Philly.
If one were to choose Bill to do the work, considering the drivers custom mods done for Thiel, and that the Thiel cross-overs compensate for the drivers used, perhaps it would be a good idea to bring the good driver for comparison matching.