Hi, i am a long time lurker from Germany and have just registered in this forum.
I spoke to Uwe Kersten Thursday last week during my lunch time regarding the CLA of a Contax II. I contacted him using the phone number on his website.
Apparently, he has his hands full at the moment with several tlr-Contaflexes, Contarexes and complete collections. I guess your Contaflex is amongst them.
He was very nice to talk to, very knowledgeable, and we talked about half an hour, even though i just intended to inform him i was sending him a camera. He explained to me the working of the rangefinder mechanism and my film spacing questions.
Let me add that Mr. Kersten is highly regarded in Germany. I have not yet seen an example of his work, but as far as i can make out, he lives and breathes German cameras and I very much assume your Contaflex is in good hands.
Good luck with that thing. Always makes me proud to see the things my country once produced. Somestimes makes me shake my head, too.