Just to wrap this up.
I was suggested a lady in Roodepoort for speaker repair (Merle's Speaker Repair), I removed the tweeter and send it to her via postnet, tweeter was repaired (recoil) and working 100%, R400 excluding shipping. I did contact Willie Louw above but decided on Merle.
Just for interest sake.
When Thiel Audio finally went bankrupt (you can go read the history at
https://en.wikipedia.org/wiki/Thiel_Audio) Rob Gillium setup a company called Coherent Source Service, they bought all available Thiel related components from the bankrupt company and focus on repairing Thiel products.
I contacted him and he had two 'new old stock' tweeters available, but at $150 a piece excl shipping I decided to try the repair option.