My plan was to try and make something out of styrene as a master which could be copied and cast.
I've made a guess about the dimensions based on what I can see from pictures and the sizes of styrene tube available and come up with this.
The close up, enlarged photograph is a little misleading, I hope, although it maybe that when I cast some copies we conclude that the top cover is a little to thick and should be a little smaller in diameter, but you'll have to take my word for it that it doesn't look like that with the naked eye.
Anyway, the RTV rubber is setting around it as I type so I shall update you when I have some cast.
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