Utopia: point taken re parting off with the centre fitted I will make them one at a time and good advice re tapping the thread with a countersunk hole to start with and using a lathe to start the thread and ensure concentric threading. I will have to investigate boring tools as all I have is drills (none of which are the correct size for tapping holes perfectly).
I will also investigate home brewed anodising, I would only ever consider silver so no need to worry about dyes and colour matching. I want the finished product to look classy not like a tart's handbag.
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