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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.