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The truss rod adjustment nut and hole are angled up, so you’ll need to use a 1/4” drive socket with an extension and aim it at the block at an upward angle. I think it’ s a 3/8” socket.
I’ve not seen an SCGC with a Martin-style hole in the brace.
Here are some inspection-camera pictures of an SCGC truss rod by Frank Ford: