Is that the hint of a slotted screw on top that has been filled? Or just the rust texture?
As an aside has the detonator case been identified? Looks like an old GPO field telephone.
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I'll need to make the recess deeper to accomodate the Tonearm part.
I tried emailing Gus Lopez (who has a real one), but apparently he doesn't reply to emails.
optical illusions again! Really good workI’ve got a theory. I do not think it is rust but the actual color of the found item. Looks like the whole part was painted silver but over time, most of it is now worn off. So it could still be a type of chair glide in a brownish plastic. And plastic would make more sense if it was a chair guide because the tend to be plastic to not scratch up floors.