high current coax feedthrus (feedthrough)

Dear all,
I have small and old vacuum induction melting chamber with coil assembly attached to rotary-high current -water cooled feedthrough
I would replace the feedthrough part in an economical way (current rate is very low and leak problems)
All the VIM manufacturer that i contacted since 3 months are not interested in to replace or repair or cost is very high (for me).
I checked a lot of vacuum specialists manufacturer but i could not found it.
Can someone suggest me a solution ?
What is the nature of insulator material beetween the copper tubes and how is coated hermetically who is making such kind of custom items
Thanks
Mike
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