Here is what I used instead of the cork they supplied with the kit.
It is a very close cell foam that I get at Hobby Lobby. This is about 1/16 thick. I used some spray contact cement to glue them in place.
I also used the same stuff on the "inside" of the CRT strap so there isn't any metal to glass contact.
I also made a "stand-off" from 1/16 phenolic sheet to help manage the HV lead from getting too close the the chassis and the lead from the fly-back to the HV rectifier.
