On Pete Dexnis' site, there is a page on the info exchange by a ct100 owner in the UK named Mike. He said in part:
--snip--
Incidently, I know of a very good transformer re-winder here in the UK that can tackle most flybacks and field transformers at reasonable cost if its of any interest to you. I've often seen US collectors say that a dead flyback can't be re-wound -- not true. I'm almost certain that a 45 year old flyback operating at 20 kV would have a very short life expectancy!
--snip--
This could be worth looking into...
linky
John