Thanks for your feedback, Chris, and for reminding me to get my Flu Shot soon. Hope you are feeling better in time for work next week.
There is, indeed, a noticeable step at the wide ends of the upper and lower porcelain insulators. Both also have what I thought were thin, hard fibre washers around the steps. A closer look after reading your post and I realized they are dried out leather. Several other fittings along the aerial base also have these gaskets and I think if I can track down a bottle of Neatsfoot Oil locally, they should all revive nicely. So I shall size the centre hole on the phenolic plate to fit the insulators.
As for the lower side of the plate, Chris, the edge is lined with a thin gasket that does cover the 8 mounting bolt holes. It looks to be about 1 inch wide and looks like it could either be cork, or a material I cannot think of the name of at the moment. Kind of a synthetic cork, made of little black, grey and brown speckles, all fused together.
David
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