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Can someone help with the best way to fill in a metal cygnet horn open slot from a radio horn, to be able to work on and Edison cygnet horn.
I thought I saw a thread about this but can't find it.
Is there such a thread or can someone suggest how best to fill in the slot to be more or less invisible?
Thanks in advance, David & Lerria

I have a Cygnet connected to an old, gigantic driver ("Utah", I think); I stacked red rubber garden hose washers inside the threaded brass fitting to attach the horn. I had the ream out the washers just a bit, to fit the cygnet.

ps - I've re-read the question and have no idea what you'e talking about, but I don't think it's what I answered.