Lionel.
I can't answer your inquiry technically, although I suspect that it is a ring spanner with a bend in it for clearance.
However, when I lived in a small town in the Riverina some years ago the term "spanner" was often applied to someone who didn't seem to be too bright.
Now without wanting to call down the wrath of the few people still burning a candle for One Nation, I might have thought of the flame headed one as a "cranky spanner"................
Cheers,



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