Andy---- Contact B&W . I had the same problem some time ago and they
sent me the parts free of charge. This was maybe 10 years ago. John K3OPC

W7CXA wrote:

I was given a B&W 850A coil recently that is lacking the spacer material on
the close wound part of the assembly. What is the best way to replace that
material? It seems to have deteriorated through the years. It is in great
shape except for that.

Thanks,
Andy W7CXA